|   
 “I think we’ve seen enough of Earth for a while,” Chrístõ 
        said as his hands moved across the drive console. “And what you 
        saw of Gallifrey was just like an English country estate. I think you 
        should experience some really alien landscapes.” Riley Davenport nodded his agreement. In truth, he didn’t have 
        a lot of choice about the destinations the TARDIS brought him to. But 
        he was quite happy to leave his fate in Chrístõ’s 
        hands. He was nearly two hundred years old, after all. Riley yielded to 
        his superior experience. A soft trill emanated from beneath the console. Chrístõ 
        grinned widely. “Let’s find somewhere that Humphrey can enjoy as much as 
        us,” he suggested. “I think I know the very place.” The TARDIS materialised in a rocky, steep-walled canyon with a wide and 
        swift flowing river running through it. With two suns beating down it 
        looked anything but the place for a darkness creature who could be killed 
        by direct sunlight. Humphrey was carefully hidden in a backpack that Riley 
        volunteered to carry before he discovered how much mischief Chrístõ’s 
        strange pet could make. The giggling noises were bad enough, but the backpack 
        wobbled like a jelly every so often making it a very strange load to carry. “He’s playing you up because you’ve never carried him 
        before,” Chrístõ explained. He opened the zip a fraction 
        and looked in. “Behave or we’ll leave you in the Cavern of 
        the Suns.” Humphrey trilled and settled down. A few minutes later a contented snoring 
        started emanating from the pack. “I mean it,” Chrístõ warned. “He knows you’re lying,” Riley pointed out. “You’d 
        never harm a living being deliberately, especially one as blameless as 
        him.” “I know. You have to behave, Humphrey. As well as tourists there 
        are some very serious religious people who meditate in the caves. They’ll 
        think you’re a demon or something and make a big fuss.” Humphrey gave one big snore then settled down. Chrístõ 
        grinned and turned his attention to the incredible landscape all around 
        them. The gorge was a quarter mile wide with the sheer walls of rich blue 
        cõpáld, one of the hardest substances in the universe, glittering 
        in the sunlight. The high plateau of cõpáld had once been 
        split apart by seismic forces exposing the river that flowed through the 
        softer strata of poulstone and a network of caves and tunnels that were 
        famous throughout the galaxy. “Why are they famous?” Riley asked. “More famous than… 
        I don’t know, Wookey Hole or the Blue John Caves in Derbyshire? There was a shrill whistle from within the backpack. Chrístõ 
        didn’t censure that one. “Humphrey has friends in both of those places. Not sure about here. 
        It would be interesting to find out. To answer your question, the Prathibtha 
        Caves of Zostria V are famous for being among the biggest, deepest and 
        most spectacular, and also for the religious rites that go on there every 
        day. The whole complex is known as the Monastery in the Rocks.” “That… sounds intriguing,” Riley managed to say. “Very intriguing. Several of the caves are used by hermit monks 
        for meditation. Others are used for group worship. The Cavern of the Suns 
        is the most important of those. They have formal services five times a 
        day in there. That one is not for Humphrey. He needs to be hunkered down 
        in the dark when we go in there.” “The people here… on this planet… the Zostrians… 
        Are they Human?” “Not in the sense of having originated on Sol Three in the Mutter 
        Spiral – Earth to you. Their DNA is significantly different. Their 
        blood is different to yours and they don’t have their internal organs 
        in the same places, but they are humanoid in the sense of having one head, 
        two arms and legs, hair and skin in the places you would expect them to 
        be.” “They… wouldn’t be… these religious rites… 
        they’re not Christian rites?” “No. They worship a god called Zost and their Holy Book is The 
        Truth of Zost.” “I was raised CofE. I was taught that there is only one God and, 
        basically, one way to praise Him. Even Methodists were suspect. Catholics 
        practically another species. The idea of taking part in the worship of 
        an alien god is a bit….” Chrístõ nodded in understanding. “We’re not really going to be taking part, just standing 
        at the back quietly. You won’t be asked to do anything against your 
        personal beliefs.” “That’s all right, then,” Riley decided and walking 
        on in silence, aware of Humphrey deliberately wobbling about in the backpack. After a quarter mile or so, the gorge closed in as they walked and the 
        river was louder and faster, the sound concentrated by the high walls. When the gorge was no more than fifty metres across, the river filling 
        most of the level ground apart from a path just wide enough for the two 
        visitors to walk side by side, they passed under a landbridge created 
        by a narrow spur of cõpáld. A tree clung to the sparse topsoil, 
        its roots bare and white in the empty air. Fifty paces on was a wider 
        ‘bridge’, again covered in the sort of vegetation that spread 
        across the top of the gorge on either side. Again they emerged into sunlight, 
        but only for a short while. Now it was more like they were entering a 
        tunnel with wide holes in the roof. “Amazing to think that something like that blue rock that made 
        up the walls of the gorge could be as thin and fragile as it is up there 
        above us,” Riley commented. “Even cõpáld can be weathered and shaped by erosion,” 
        Chrístõ replied. “Once seismic forces cause cracks 
        to form, even diamond is vulnerable, let alone cõpáld.” Riley looked up again, nervously. “It’s not going to fall while you’re passing under 
        it,” Chrístõ assured him. These ‘bridges’ of cõpáld were only the preview 
        to the main show. Before they were cut off completely from the natural 
        light they reached the entrance to the famous Prathibtha Caves. Riley 
        had expected to have to duck as he passed into the cave, but the entrance 
        was bigger than Victoria station. Four locomotives side by side could 
        have parked there and three stacked on top of each other would still be 
        short of the roof. They were both a little surprised to see a fence with a toll booth and 
        a turnstile blocking the way some fifty paces from the sheer cliff face 
        of deep blue cõpáld. A small crowd were passing through 
        the barrier one at a time. They were a mixed group of biped humanoids 
        who very definitely didn’t originate on Earth. Chrístõ 
        recognised the ochre-red skinned Zocci and eucalyptus-green Vinvocci as 
        well as chalk white, stick-thin, seven-foot tall Meringians and two ebony giants from Epploxia who were even taller 
        with broad shoulders and stout limbs. “University of Cassiopeia,” Chrístõ noted. 
        “They accept every sentient life form. On their own worlds, Zocci 
        and Vinvocci hate each other, but at the University they have to work 
        together.” “They’re visiting the caves.” “Famous throughout the galaxy.” Riley was going to say something else but his eyes caught a movement 
        high up on the cliff. A group of young Zostrians, distinguished from the 
        visitors by their short stature and round faces stood on an outcrop directly 
        above the huge cave entrance. Suddenly one of them leaped head first off 
        the ledge. Riley gasped in shock before he realised that the man had a 
        long elastic rope attached to his legs. He swung at the end of it several 
        times before his friends reeled him in. “It’s called the ‘Trial of Zost’,” Chrístõ 
        explained. “A proof of faith. It’s not compulsory for visitors, 
        only Zostrians preparing for Confirmation.” “Glad to hear it,” Riley answered. “Confirmation is 
        a bit easier in the CofE.” Chrístõ smiled and refrained from explaining that such 
        activity was called ‘bungee-jumping’ on Earth at the latter 
        end of Riley’s century and didn’t require religious faith, 
        only in the person tying the rope. The university group passed through the turnstile. Chrístõ 
        and Riley moved up to discover that the booth was unmanned. Maps and timetables 
        for the religious services were free to take. There was no formal charge 
        for entry, but a touch screen allowed visitors to make donations from 
        three hundred different currencies and five hundred types of credit card. 
        Chrístõ made a generous donation. He hadn’t used much 
        of his allowance during his visits to parts of ancient Earth and he could 
        afford generosity. He and Riley passed through the turnstile and headed 
        towards the cavernous entrance to the famous Prathibtha Caves. It was a beautiful introduction to the cave system. High above their 
        heads, higher than the ceiling of any cathedral, railway station or even 
        the Albert Hall, a million glittering stalactites infused with a natural 
        phosphorescence caused by the chemical reaction of rain water and dissolved 
        poulstone lit the cavern with a soft blue-green glow. “It’s like being underwater,” Chrístõ 
        remarked as he unzipped the backpack and let Humphrey tumble out excitedly. 
        “Keep close to us and no scaring the tourists,” he ordered. 
        Humphrey responded with a trill that might have had a hint of defiance 
        in it, but he basked in the harmless aquatic glow as he bowled along ‘at 
        heel’ like a well-trained dog. At the far end of the entrance cave were two options. The voices of the 
        university crowd echoed in a wide, tall passage reminiscent of the processional 
        entrance to Westminster Abbey. To the left of it was a tunnel that a tall 
        man could just stand upright in. Chrístõ consulted the map. “These are the ?????? ????? and the ????? ?????. Depending on your 
        translation programme that’s either big entrance and small entrance 
        or big hole and small hole. Both sound like potential innuendos, so let’s 
        not dwell on them for too long. I suggest….” But Humphrey made the decision for them, rolling into the small hole. “He’s probably right,” Riley considered. “I don’t 
        know if I want to be trailing after the students all day. Besides – 
        ‘I took the one less travelled by….’” “And that has made all the difference.” Chrístõ 
        smiled as he supplied the last line of Robert Frost’s most famous 
        poem. “I’ve lived by that axiom ever since I set out into 
        the universe on my first field trip. Humphrey’s choice it is.” The blue-green glow was fainter in the passage but enough to see by. 
        Humphrey bowled ahead as Chrístõ and Riley both inclined 
        their heads enough to walk without fear of banging them on the ceiling. 
        At intervals they paused to look at primitive drawings that had been painted 
        with inky clay some half a million years ago. They depicted a hunter-gatherer 
        society that hunkered down in the caves for the winter and developed the 
        earliest religious devotion, praying for the return of warmth and abundant 
        food, the necessities of primitive life. “What’s that?” Riley asked, pointing to a misshapen 
        giant in one image. “Something they hunted?” Chrístõ guessed. “Like 
        a mammoth on Earth?” “It doesn’t quite look like a hunting party,” Riley 
        mused. Chrístõ agreed. The primitive figures seemed to be 
        bowing before the strange, amorphous creature. But it was difficult to 
        read anything into such basic images. They left the mystery and moved 
        on, the tunnel inclining downwards gently but insistently until Chrístõ 
        estimated that they were a good quarter of a mile below the level where 
        they entered the tunnel. “You can do that sort of maths in your head?” Riley asked. 
        “That’s distance times gradient isn’t it?” “I can feel it,” Chrístõ answered. “It’s 
        not a regular Time Lord talent. I think it’s because there are gold 
        mines on our family estate. Not that any of my family ever did any such 
        a manual job as gold mining, but we seem to have an instinct for being 
        underground.” “I just feel tired,” Riley commented. “Funny that, 
        it’s not THAT steep and I’ve walked more than a quarter mile 
        downhill before.” “The air is fine,” Chrístõ noted. “Yes, 
        I can detect the constituents of air. Maybe you need a quick energy burst. 
        Hold on.” He shrugged off his own backpack and fished in the side pocket for two 
        foil wrapped disks. “Kendal mint cake,” he said. “One of the many things 
        your world does well. Better tasting than the energy bars sold in space 
        ports, bigger sugar rush for tired explorers.” Riley accepted the snack gratefully as they continued on past increasingly 
        detailed images in which the blobby giant featured often. Chrístõ 
        felt that he ought to study them more closely, but there was so much more 
        he wanted to see and if Riley was already tired they would barely get 
        through it all. The tunnel’s gradient flattened out and they reached the first 
        of the contemplation caves. The two visitors, with Humphrey keeping close 
        by, walked on a special surface that softened footsteps as they passed 
        through a cave with a floor broken up by thick stalagmites reaching up 
        to meet their stalactites counterparts. Here and there a thick pillar 
        was formed by the meeting of the two. Pools of clear, still water reflected 
        the blue-green ceiling. Between the stalagmites, sitting nearly as still, were men in russet-red 
        cowled cloaks. They were the Zost worshipping monks who came to mediate 
        here, deep underground, away from any distractions. There were twenty 
        of them here, each locked in intense trances from which the footsteps 
        of visitors would not have been a disturbance. The softening of the sound 
        was merely a courtesy to them. Neither of the visitors spoke as they passed through the cave. Even Humphrey 
        was quiet. When they passed through a natural portal into another passage 
        both breathed out. They had almost forgotten to breathe in the still atmosphere 
        of that cave. “Those monks are incredible,” Riley said. “They don’t 
        even look like they’re breathing.” “If they’ve reached a sufficient level of trance they probably 
        aren’t taking more than a breath a minute,” Chrístõ 
        explained. “Heart rate will be slowed right down. They won’t 
        need more than that.” “Incredible.” “I can slow my breathing down to one breath an hour,’ Chrístõ 
        added. “But that’s a specific Time Lord trick. Most other 
        species can’t go that deep.” “I wouldn’t know where to start.” “I could show you. It is very good for the soul to purge it of 
        all worries and complications for a while.” “Some other time,” Riley said vaguely. “Is Humphrey 
        all right? He seems… quiet.” Humphrey was not quiet. He was emitting a very low sound, almost too 
        low to hear. Chrístõ concentrated on it and was filled with 
        a seen of foreboding. “What is it, old boy?” he asked. Humphrey trilled sadly but 
        wasn’t able to explain his mood. “I don’t know. Perhaps 
        he’s disappointed there aren’t any of his kind around these 
        caves. But we knew it was a long shot. This planet is right on the outer 
        edge of the Milky Way, millions of light years from where you were born, 
        old boy, even further to Earth where we found the other colony of your 
        kind.” “I don’t think he’s SAD,” Riley pointed out. 
        “I think he’s tired, like me.” “I have never heard of him being tired before. I didn’t think 
        his body used energy the same way. Perhaps he’s empathising with 
        you.” That seemed like a reasonable explanation, though Chrístõ 
        wasn’t completely satisfied with it – despite it being his 
        own suggestion. He couldn’t understand, either, why Riley was so 
        tired. The air was good. They were not tackling any serious gradients. 
        The had climbed the Hanging Gardens, the Pharos Lighthouse, the Mausoleum, with 
        no more than pauses to catch a breath. Perhaps Riley was coming down with flu or something? When they got back 
        to the TARDIS a quick medical scan might be in order. Meanwhile they tried to enjoy the beautiful caverns and caves with magnificent 
        examples of natural karst formations – a giant blue-green luminous 
        ‘pipe organ’ formed on the wall of one cavern, the natural 
        sculpture reflected in a crystal clear lake. The Forest Cavern was so 
        densely packed with floor to ceiling pillars where stalagmites and stalactites 
        had joined that it really resembled a petrified forest. Riley tried to enjoy all of the wondrous sights, but his weariness was 
        more and more of a hindrance to him the further they walked. “I think we should call it a day,” Chrístõ 
        decided. “I should take you back to the TARDIS.” He consulted 
        the map. “The quickest way out, now, is up through the Cavern of 
        the Suns. There is a service on, but we’ll go quietly and try not 
        to disturb anyone.” “Quietly is the only way I CAN go at the moment,” Riley answered 
        with a last vestige of energy. He stumbled along behind Chrístõ, 
        Humphrey at his heels in a desultory way. The gentle incline towards the 
        upper level Cavern of the Suns exhausted him. Chrístõ dropped 
        back and supported him. “Not far, now,” he said. “Just through the Cavern, 
        then a short way to the large entrance.” “To tired even for innuendo,” Riley murmured. When they reached the Cavern of the Suns, though, they were both shocked. 
        The massive cavern was famous for two huge holes in the roof that looked 
        like huge eyes framing parts of the Zostrian sky and, at present, a fraction 
        of one of the planet’s five moons. Five times during each day, the 
        precise moment carefully worked out by Zostrian astronomers, one of the 
        suns aligned with either the left or right eye, filling the cavern with 
        warm, bright light. The services of devotion to Zost were timed so that 
        the explosion of light came at the climax of the ceremony, filling the 
        worshippers with a sense of the miraculous. But something was wrong. The cavern was not filled with voices intoning 
        the Word of Zost. Instead, there was an eerie silence. The worshippers, 
        including the multi-raced group of university students, were all slumped 
        on the floor. Chrístõ left Riley leaning against the wall and examined 
        one of the Zostrian believers as well as the visitors who had very different 
        metabolisms. All were in deep REM sleep, and they couldn’t be woken 
        up by any ordinary means. He decided not to try. Instead he brought Riley and let him lie down 
        with them. He opened the backpack and invited Humphrey to crawl back inside. “You’re safer in there,” he told his strange friend. 
        “You stay there with everyone else. Don’t snore too loud. 
        This is still a place of worship and snoring is rude.” Humphrey trilled weakly as Chrístõ zipped him up safely. 
        Riley was already asleep. He reluctantly left his friends and the other 
        victims of something he was sure was nothing natural to this place. He had one clue. He consulted the map and found a narrow passage, not 
        normally used by the tourists, that intersected with the small entrance 
        tunnel. He was thankful for the blue-green glow as he ran over an uneven 
        surface that hadn’t been worn smooth by regular footfall. He was 
        bent almost double at one point, but he came through at last to the tunnel 
        he and Riley had walked along – the one with the interesting primitive 
        drawings. He studied them carefully this time, and a lot of his questions were 
        answered. For the rest he needed more than a map of the caves. He ran downhill, towards the Caves of Contemplation. He found the big 
        one where twenty of the monks silently knelt among the karst formations. 
        He chose a young monk who hadn’t yet grown a long beard through 
        such intense devotions. He knelt opposite him, like a reflection. He let 
        his own mind slip into a deep trance, but one where he, metaphorically, 
        at least, kept one eye on the waking world. He reached out to the young monk. He found his name and called to him. “Kayle,” he called out with his mind. “I looked at 
        the pictures. Long, long ago a monster lived in these caves, didn’t 
        it?” “The Thesperus,” Kayle replied. “The primitive people 
        worshipped it. Before we knew the love of Zost. The Thesperus took part 
        of their souls as part of their devotions. Not much, but a little each day. But… it got greedy. It took more. 
        They were courageous. They fought the false god and imprisoned it deep 
        beneath the caves of devotion, where it could not reach them. It starved 
        and withered.” “Yes, I read that, too,” Chrístõ said. “But 
        I don’t think it’s dead. While it was just generations of 
        your lot meditating, it wasn’t able to do much… just a fraction 
        of your lifeforce – your physical energy, not your soul. Nothing 
        can take any sentient being’s soul except his own dark deeds. It 
        took energy. But over time, it grew stronger. The popularity of the caves 
        with secular visitors allowed it to take more and more. Now it really 
        is greedy and it is hurting people. My Human friend and a lot of other 
        people are being used by the Thesperus and I have to stop it.” “We hold it back with our meditations,” Kayle said. “But 
        you are right, it has grown stronger.” “It never occurred go anyone to close the caves to visitors?” “I regret the elders of our Brotherhood did not do that.” “Never mind. Do you know how to get to the place where the Thesperus 
        was incarcerated?” “I think so.” Chrístõ felt an image of the 
        tourist map with another of those unused passages marked. “But the 
        way is blocked. It has been blocked since before we knew the love of Zost.” “When the time is right, you and your fellow Brothers concentrate 
        your meditations. You’ll know when and where. You can do your bit 
        to make this right.” He gently withdrew from the psychic connection and opened his eyes. Kayle 
        did not move. Chrístõ quietly but quickly left the Cave 
        of Devotions. He closed his eyes and consulted the mental map now lodged 
        in his mind and turned the right way. It was darker now as he descended through very tight, low passages. There 
        had been far less karst formation here, below the level of the underground 
        river and the cave lakes. Only small amounts of the blue-green glow kept 
        the passages from being pitch black. Chrístõ hurried, disregarding 
        his own safety. A few bumped heads and skinned elbows didn’t matterThe 
        Prathibtha Caves “I think we’ve seen enough of Earth for a while,” Chrístõ 
        said as his hands moved across the drive console. “And what you 
        saw of Gallifrey was just like an English country estate. I think you 
        should experience some really alien landscapes.” Riley Davenport nodded his agreement. In truth, he didn’t have 
        a lot of choice about the destinations the TARDIS brought him to. But 
        he was quite happy to leave his fate in Chrístõ’s 
        hands. He was nearly two hundred years old, after all. Riley yielded to 
        his superior experience. A soft trill emanated from beneath the console. Chrístõ 
        grinned widely. “Let’s find somewhere that Humphrey can enjoy as much as 
        us,” he suggested. “I think I know the very place.” The TARDIS materialised in a rocky, steep-walled canyon with a wide and 
        swift flowing river running through it. With two suns beating down it 
        looked anything but the place for a darkness creature who could be killed 
        by direct sunlight. Humphrey was carefully hidden in a backpack that Riley 
        volunteered to carry before he discovered how much mischief Chrístõ’s 
        strange pet could make. The giggling noises were bad enough, but the backpack 
        wobbled like a jelly every so often making it a very strange load to carry. “He’s playing you up because you’ve never carried him 
        before,” Chrístõ explained. He opened the zip a fraction 
        and looked in. “Behave or we’ll leave you in the Cavern of 
        the Suns.” Humphrey trilled and settled down. A few minutes later a contented snoring 
        started emanating from the pack. “I mean it,” Chrístõ warned. “He knows you’re lying,” Riley pointed out. “You’d 
        never harm a living being deliberately, especially one as blameless as 
        him.” “I know. You have to behave, Humphrey. As well as tourists there 
        are some very serious religious people who meditate in the caves. They’ll 
        think you’re a demon or something and make a big fuss.” Humphrey gave one big snore then settled down. Chrístõ 
        grinned and turned his attention to the incredible landscape all around 
        them. The gorge was a quarter mile wide with the sheer walls of rich blue 
        cõpáld, one of the hardest substances in the universe, glittering 
        in the sunlight. The high plateau of cõpáld had once been 
        split apart by seismic forces exposing the river that flowed through the 
        softer strata of poulstone and a network of caves and tunnels that were 
        famous throughout the galaxy. “Why are they famous?” Riley asked. “More famous than… 
        I don’t know, Wookey Hole or the Blue John Caves in Derbyshire? There was a shrill whistle from within the backpack. Chrístõ 
        didn’t censure that one. “Humphrey has friends in both of those places. Not sure about here. 
        It would be interesting to find out. To answer your question, the Prathibtha 
        Caves of Zostria V are famous for being among the biggest, deepest and 
        most spectacular, and also for the religious rites that go on there every 
        day. The whole complex is known as the Monastery in the Rocks.” “That… sounds intriguing,” Riley managed to say. “Very intriguing. Several of the caves are used by hermit monks 
        for meditation. Others are used for group worship. The Cavern of the Suns 
        is the most important of those. They have formal services five times a 
        day in there. That one is not for Humphrey. He needs to be hunkered down 
        in the dark when we go in there.” “The people here… on this planet… the Zostrians… 
        Are they Human?” “Not in the sense of having originated on Sol Three in the Mutter 
        Spiral – Earth to you. Their DNA is significantly different. Their 
        blood is different to yours and they don’t have their internal organs 
        in the same places, but they are humanoid in the sense of having one head, 
        two arms and legs, hair and skin in the places you would expect them to 
        be.” “They… wouldn’t be… these religious rites… 
        they’re not Christian rites?” “No. They worship a god called Zost and their Holy Book is The 
        Truth of Zost.” “I was raised CofE. I was taught that there is only one God and, 
        basically, one way to praise Him. Even Methodists were suspect. Catholics 
        practically another species. The idea of taking part in the worship of 
        an alien god is a bit….” Chrístõ nodded in understanding. “We’re not really going to be taking part, just standing 
        at the back quietly. You won’t be asked to do anything against your 
        personal beliefs.” “That’s all right, then,” Riley decided and walking 
        on in silence, aware of Humphrey deliberately wobbling about in the backpack. After a quarter mile or so, the gorge closed in as they walked and the 
        river was louder and faster, the sound concentrated by the high walls. When the gorge was no more than fifty metres across, the river filling 
        most of the level ground apart from a path just wide enough for the two 
        visitors to walk side by side, they passed under a landbridge created 
        by a narrow spur of cõpáld. A tree clung to the sparse topsoil, 
        its roots bare and white in the empty air. Fifty paces on was a wider 
        ‘bridge’, again covered in the sort of vegetation that spread 
        across the top of the gorge on either side. Again they emerged into sunlight, 
        but only for a short while. Now it was more like they were entering a 
        tunnel with wide holes in the roof. “Amazing to think that something like that blue rock that made 
        up the walls of the gorge could be as thin and fragile as it is up there 
        above us,” Riley commented. “Even cõpáld can be weathered and shaped by erosion,” 
        Chrístõ replied. “Once seismic forces cause cracks 
        to form, even diamond is vulnerable, let alone cõpáld.” Riley looked up again, nervously. “It’s not going to fall while you’re passing under 
        it,” Chrístõ assured him. These ‘bridges’ of cõpáld were only the preview 
        to the main show. Before they were cut off completely from the natural 
        light they reached the entrance to the famous Prathibtha Caves. Riley 
        had expected to have to duck as he passed into the cave, but the entrance 
        was bigger than Victoria station. Four locomotives side by side could 
        have parked there and three stacked on top of each other would still be 
        short of the roof. They were both a little surprised to see a fence with a toll booth and 
        a turnstile blocking the way some fifty paces from the sheer cliff face 
        of deep blue cõpáld. A small crowd were passing through 
        the barrier one at a time. They were a mixed group of biped humanoids 
        who very definitely didn’t originate on Earth. Chrístõ 
        recognised the ochre-red skinned Zocci and eucalyptus-green Vinvocci as 
        well as chalk white, stick-thin, seven-foot tall Meringians and two ebony giants from Epploxia who were even taller 
        with broad shoulders and stout limbs. “University of Cassiopeia,” Chrístõ noted. 
        “They accept every sentient life form. On their own worlds, Zocci 
        and Vinvocci hate each other, but at the University they have to work 
        together.” “They’re visiting the caves.” “Famous throughout the galaxy.” Riley was going to say something else but his eyes caught a movement 
        high up on the cliff. A group of young Zostrians, distinguished from the 
        visitors by their short stature and round faces stood on an outcrop directly 
        above the huge cave entrance. Suddenly one of them leaped head first off 
        the ledge. Riley gasped in shock before he realised that the man had a 
        long elastic rope attached to his legs. He swung at the end of it several 
        times before his friends reeled him in. “It’s called the ‘Trial of Zost’,” Chrístõ 
        explained. “A proof of faith. It’s not compulsory for visitors, 
        only Zostrians preparing for Confirmation.” “Glad to hear it,” Riley answered. “Confirmation is 
        a bit easier in the CofE.” Chrístõ smiled and refrained from explaining that such 
        activity was called ‘bungee-jumping’ on Earth at the latter 
        end of Riley’s century and didn’t require religious faith, 
        only in the person tying the rope. The university group passed through the turnstile. Chrístõ 
        and Riley moved up to discover that the booth was unmanned. Maps and timetables 
        for the religious services were free to take. There was no formal charge 
        for entry, but a touch screen allowed visitors to make donations from 
        three hundred different currencies and five hundred types of credit card. 
        Chrístõ made a generous donation. He hadn’t used much 
        of his allowance during his visits to parts of ancient Earth and he could 
        afford generosity. He and Riley passed through the turnstile and headed 
        towards the cavernous entrance to the famous Prathibtha Caves. It was a beautiful introduction to the cave system. High above their 
        heads, higher than the ceiling of any cathedral, railway station or even 
        the Albert Hall, a million glittering stalactites infused with a natural 
        phosphorescence caused by the chemical reaction of rain water and dissolved 
        poulstone lit the cavern with a soft blue-green glow. “It’s like being underwater,” Chrístõ 
        remarked as he unzipped the backpack and let Humphrey tumble out excitedly. 
        “Keep close to us and no scaring the tourists,” he ordered. 
        Humphrey responded with a trill that might have had a hint of defiance 
        in it, but he basked in the harmless aquatic glow as he bowled along ‘at 
        heel’ like a well-trained dog. At the far end of the entrance cave were two options. The voices of the 
        university crowd echoed in a wide, tall passage reminiscent of the processional 
        entrance to Westminster Abbey. To the left of it was a tunnel that a tall 
        man could just stand upright in. Chrístõ consulted the map. “These are the ?????? ????? and the ????? ?????. Depending on your 
        translation programme that’s either big entrance and small entrance 
        or big hole and small hole. Both sound like potential innuendos, so let’s 
        not dwell on them for too long. I suggest….” But Humphrey made the decision for them, rolling into the small hole. “He’s probably right,” Riley considered. “I don’t 
        know if I want to be trailing after the students all day. Besides – 
        ‘I took the one less travelled by….’” “And that has made all the difference.” Chrístõ 
        smiled as he supplied the last line of Robert Frost’s most famous 
        poem. “I’ve lived by that axiom ever since I set out into 
        the universe on my first field trip. Humphrey’s choice it is.” The blue-green glow was fainter in the passage but enough to see by. 
        Humphrey bowled ahead as Chrístõ and Riley both inclined 
        their heads enough to walk without fear of banging them on the ceiling. 
        At intervals they paused to look at primitive drawings that had been painted 
        with inky clay some half a million years ago. They depicted a hunter-gatherer 
        society that hunkered down in the caves for the winter and developed the 
        earliest religious devotion, praying for the return of warmth and abundant 
        food, the necessities of primitive life. “What’s that?” Riley asked, pointing to a misshapen 
        giant in one image. “Something they hunted?” Chrístõ guessed. “Like 
        a mammoth on Earth?” “It doesn’t quite look like a hunting party,” Riley 
        mused. Chrístõ agreed. The primitive figures seemed to be 
        bowing before the strange, amorphous creature. But it was difficult to 
        read anything into such basic images. They left the mystery and moved 
        on, the tunnel inclining downwards gently but insistently until Chrístõ 
        estimated that they were a good quarter of a mile below the level where 
        they entered the tunnel. “You can do that sort of maths in your head?” Riley asked. 
        “That’s distance times gradient isn’t it?” “I can feel it,” Chrístõ answered. “It’s 
        not a regular Time Lord talent. I think it’s because there are gold 
        mines on our family estate. Not that any of my family ever did any such 
        a manual job as gold mining, but we seem to have an instinct for being 
        underground.” “I just feel tired,” Riley commented. “Funny that, 
        it’s not THAT steep and I’ve walked more than a quarter mile 
        downhill before.” “The air is fine,” Chrístõ noted. “Yes, 
        I can detect the constituents of air. Maybe you need a quick energy burst. 
        Hold on.” He shrugged off his own backpack and fished in the side pocket for two 
        foil wrapped disks. “Kendal mint cake,” he said. “One of the many things 
        your world does well. Better tasting than the energy bars sold in space 
        ports, bigger sugar rush for tired explorers.” Riley accepted the snack gratefully as they continued on past increasingly 
        detailed images in which the blobby giant featured often. Chrístõ 
        felt that he ought to study them more closely, but there was so much more 
        he wanted to see and if Riley was already tired they would barely get 
        through it all. The tunnel’s gradient flattened out and they reached the first 
        of the contemplation caves. The two visitors, with Humphrey keeping close 
        by, walked on a special surface that softened footsteps as they passed 
        through a cave with a floor broken up by thick stalagmites reaching up 
        to meet their stalactites counterparts. Here and there a thick pillar 
        was formed by the meeting of the two. Pools of clear, still water reflected 
        the blue-green ceiling. Between the stalagmites, sitting nearly as still, were men in russet-red 
        cowled cloaks. They were the Zost worshipping monks who came to mediate 
        here, deep underground, away from any distractions. There were twenty 
        of them here, each locked in intense trances from which the footsteps 
        of visitors would not have been a disturbance. The softening of the sound 
        was merely a courtesy to them. Neither of the visitors spoke as they passed through the cave. Even Humphrey 
        was quiet. When they passed through a natural portal into another passage 
        both breathed out. They had almost forgotten to breathe in the still atmosphere 
        of that cave. “Those monks are incredible,” Riley said. “They don’t 
        even look like they’re breathing.” “If they’ve reached a sufficient level of trance they probably 
        aren’t taking more than a breath a minute,” Chrístõ 
        explained. “Heart rate will be slowed right down. They won’t 
        need more than that.” “Incredible.” “I can slow my breathing down to one breath an hour,’ Chrístõ 
        added. “But that’s a specific Time Lord trick. Most other 
        species can’t go that deep.” “I wouldn’t know where to start.” “I could show you. It is very good for the soul to purge it of 
        all worries and complications for a while.” “Some other time,” Riley said vaguely. “Is Humphrey 
        all right? He seems… quiet.” Humphrey was not quiet. He was emitting a very low sound, almost too 
        low to hear. Chrístõ concentrated on it and was filled with 
        a seen of foreboding. “What is it, old boy?” he asked. Humphrey trilled sadly but 
        wasn’t able to explain his mood. “I don’t know. Perhaps 
        he’s disappointed there aren’t any of his kind around these 
        caves. But we knew it was a long shot. This planet is right on the outer 
        edge of the Milky Way, millions of light years from where you were born, 
        old boy, even further to Earth where we found the other colony of your 
        kind.” “I don’t think he’s SAD,” Riley pointed out. 
        “I think he’s tired, like me.” “I have never heard of him being tired before. I didn’t think 
        his body used energy the same way. Perhaps he’s empathising with 
        you.” That seemed like a reasonable explanation, though Chrístõ 
        wasn’t completely satisfied with it – despite it being his 
        own suggestion. He couldn’t understand, either, why Riley was so 
        tired. The air was good. They were not tackling any serious gradients. 
        The had climbed the Hanging Gardens, the Pharos Lighthouse, the Mausoleum, with 
        no more than pauses to catch a breath. Perhaps Riley was coming down with flu or something? When they got back 
        to the TARDIS a quick medical scan might be in order. Meanwhile they tried to enjoy the beautiful caverns and caves with magnificent 
        examples of natural karst formations – a giant blue-green luminous 
        ‘pipe organ’ formed on the wall of one cavern, the natural 
        sculpture reflected in a crystal clear lake. The Forest Cavern was so 
        densely packed with floor to ceiling pillars where stalagmites and stalactites 
        had joined that it really resembled a petrified forest. Riley tried to enjoy all of the wondrous sights, but his weariness was 
        more and more of a hindrance to him the further they walked. “I think we should call it a day,” Chrístõ 
        decided. “I should take you back to the TARDIS.” He consulted 
        the map. “The quickest way out, now, is up through the Cavern of 
        the Suns. There is a service on, but we’ll go quietly and try not 
        to disturb anyone.” “Quietly is the only way I CAN go at the moment,” Riley answered 
        with a last vestige of energy. He stumbled along behind Chrístõ, 
        Humphrey at his heels in a desultory way. The gentle incline towards the 
        upper level Cavern of the Suns exhausted him. Chrístõ dropped 
        back and supported him. “Not far, now,” he said. “Just through the Cavern, 
        then a short way to the large entrance.” “To tired even for innuendo,” Riley murmured. When they reached the Cavern of the Suns, though, they were both shocked. 
        The massive cavern was famous for two huge holes in the roof that looked 
        like huge eyes framing parts of the Zostrian sky and, at present, a fraction 
        of one of the planet’s five moons. Five times during each day, the 
        precise moment carefully worked out by Zostrian astronomers, one of the 
        suns aligned with either the left or right eye, filling the cavern with 
        warm, bright light. The services of devotion to Zost were timed so that 
        the explosion of light came at the climax of the ceremony, filling the 
        worshippers with a sense of the miraculous. But something was wrong. The cavern was not filled with voices intoning 
        the Word of Zost. Instead, there was an eerie silence. The worshippers, 
        including the multi-raced group of university students, were all slumped 
        on the floor. Chrístõ left Riley leaning against the wall and examined 
        one of the Zostrian believers as well as the visitors who had very different 
        metabolisms. All were in deep REM sleep, and they couldn’t be woken 
        up by any ordinary means. He decided not to try. Instead he brought Riley and let him lie down 
        with them. He opened the backpack and invited Humphrey to crawl back inside. “You’re safer in there,” he told his strange friend. 
        “You stay there with everyone else. Don’t snore too loud. 
        This is still a place of worship and snoring is rude.” Humphrey trilled weakly as Chrístõ zipped him up safely. 
        Riley was already asleep. He reluctantly left his friends and the other 
        victims of something he was sure was nothing natural to this place. He had one clue. He consulted the map and found a narrow passage, not 
        normally used by the tourists, that intersected with the small entrance 
        tunnel. He was thankful for the blue-green glow as he ran over an uneven 
        surface that hadn’t been worn smooth by regular footfall. He was 
        bent almost double at one point, but he came through at last to the tunnel 
        he and Riley had walked along – the one with the interesting primitive 
        drawings. He studied them carefully this time, and a lot of his questions were 
        answered. For the rest he needed more than a map of the caves. He ran downhill, towards the Caves of Contemplation. He found the big 
        one where twenty of the monks silently knelt among the karst formations. 
        He chose a young monk who hadn’t yet grown a long beard through 
        such intense devotions. He knelt opposite him, like a reflection. He let 
        his own mind slip into a deep trance, but one where he, metaphorically, 
        at least, kept one eye on the waking world. He reached out to the young monk. He found his name and called to him. “Kayle,” he called out with his mind. “I looked at 
        the pictures. Long, long ago a monster lived in these caves, didn’t 
        it?” “The Thesperus,” Kayle replied. “The primitive people 
        worshipped it. Before we knew the love of Zost. The Thesperus took part 
        of their souls as part of their devotions. Not much, but a little each day. But… it got greedy. It took more. 
        They were courageous. They fought the false god and imprisoned it deep 
        beneath the caves of devotion, where it could not reach them. It starved 
        and withered.” “Yes, I read that, too,” Chrístõ said. “But 
        I don’t think it’s dead. While it was just generations of 
        your lot meditating, it wasn’t able to do much… just a fraction 
        of your lifeforce – your physical energy, not your soul. Nothing 
        can take any sentient being’s soul except his own dark deeds. It 
        took energy. But over time, it grew stronger. The popularity of the caves 
        with secular visitors allowed it to take more and more. Now it really 
        is greedy and it is hurting people. My Human friend and a lot of other 
        people are being used by the Thesperus and I have to stop it.” “We hold it back with our meditations,” Kayle said. “But 
        you are right, it has grown stronger.” “It never occurred go anyone to close the caves to visitors?” “I regret the elders of our Brotherhood did not do that.” “Never mind. Do you know how to get to the place where the Thesperus 
        was incarcerated?” “I think so.” Chrístõ felt an image of the 
        tourist map with another of those unused passages marked. “But the 
        way is blocked. It has been blocked since before we knew the love of Zost.” “When the time is right, you and your fellow Brothers concentrate 
        your meditations. You’ll know when and where. You can do your bit 
        to make this right.” He gently withdrew from the psychic connection and opened his eyes. Kayle 
        did not move. Chrístõ quietly but quickly left the Cave 
        of Devotions. He closed his eyes and consulted the mental map now lodged 
        in his mind and turned the right way. It was darker now as he descended through very tight, low passages. There 
        had been far less karst formation here, below the level of the underground 
        river and the cave lakes. Only small amounts of the blue-green glow kept 
        the passages from being pitch black. Chrístõ hurried, disregarding 
        his own safety. A few bumped heads and skinned elbows didn’t matterwhen 
        his friends and dozens of innocent civilians were at risk. As predicted, the tunnel ended in a blockage. The rocks that fell did 
        so a very long time ago and the mixture of soft poulstone and hard cõpáld 
        was a very solid mass. But he was a Time Lord. Millennia were nothing to him. Well, in truth, they were. This was going to take a lot of effort. When 
        he first learnt to excite rock with the power of his mind, he had fainted. 
        He only avoided the derision of his classmates because four other ‘pure-blooded’ 
        Time Lord candidates took even longer to recover than he did. But that lesson had involved solid pieces of granite. This was an amalgam. 
        Reminding it that it had once been separate pieces of rock was probably 
        easier. Probably…. It was still hard work. His mind hurt as he concentrated all of his will 
        on the ten feet of densely packed debris. But slowly it began to happen. The wall crumbled, a few grains at first, 
        but then a torrent of loose pebbles and dust. He stepped back and watched 
        the wall collapse leaving a dark void behind. A dark void from which a ferocious roar came along with the stale smell 
        of air that had been trapped for millennia. Then he saw movement. Again 
        he took an instinctive step backwards. He knew what the creature – 
        the Thesperus – would look like and he wasn’t entirely looking 
        forward to a close encounter. It was mud coloured, thick, rippling flesh like a manatee but four time 
        the size and shuffling forward on its stomach. The sound of its body moving 
        over the loose gravel was indescribably horrible. “This is when I need you all,” Chrístõ said 
        with his mind. He felt the answer from Kayle and his friends as a gestalt 
        voice. Then he felt them join with him. Together they focussed their minds 
        on the creature. They blocked it from taking any more energy from the 
        victims above, then they turned their minds on it. They found its central 
        nervous system and shut it down. The brain began to die. It fought back 
        at first, but they were too strong. Soon the fight was over. Chrístõ 
        felt a twinge of guilt about the final coup de grâce. Killing anything 
        was not something he took lightly. But this creature had been hurting 
        people for too long. It had to be stopped. Besides, he had realised something as he fought against its mind. Thesperus 
        was not indigenous to this planet. It had come here all that time ago 
        as a space born egg with a shell capable of surviving the heat of descent 
        through the atmosphere and an impact with the ground that may well have 
        begun the seismic shift that created the gorge. It installed itself below 
        ground and waited for its food supply to come to it. A parasite, and one that may have brothers on other worlds causing just 
        as much harm to innocents. “Riley,” he whispered aloud. He turned his mind back to those 
        that had helped him. “Thank you. Violence does not come easy to 
        any of you, either, but you did what had to be done. I must see to my 
        friends, now.” “May the love of Zost be upon you,” they answered. Then, 
        just to prove that Time Lords weren’t the only ones who could move 
        mountains with their minds, they created a new rock fall that buried the 
        body of the Thesperus for eternity. Chrístõ ran back to the Cavern of the Suns. He found Riley 
        among those waking in confusion. He hugged him gratefully. “I’m still engaged to a lovely girl,” Chrístõ 
        assured him. “But I’m glad you’re all right.” “I’m not complaining,” Riley answered. “What 
        happened?” “Long story.” Inside the backpack Humphrey was wide awake, too, and noisily advertised 
        himself. “Sorry, old boy,” Chrístõ told him. “You 
        stay put for a little while longer.” He was still embracing Riley when the five times daily miracle of nature 
        happened. One of the suns aligned with the right eye in the ceiling and 
        bright, warm light filled the cavern, dazzling still confused eyes but 
        filling hearts with unbounded joy. The Minister of Zost who had been afflicted along with everyone else 
        fond his voice as the light reached him. His prayer echoed around the 
        cavern. “All praise to Zost, bringer of light and of life.” “Praise Zost,” Riley responded with the rest, despite his 
        CofE roots and enjoyed Chrístõ’s embrace all the more. Inside the backpack, Humphrey trilled his agreement and wobbled with 
        shared joy. 
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