him. He was Clavain’s height and dressed in similarly dark clothes — Clavain had been divested of his spacesuit — though there the resemblance ended. The man’s apparent physiological age was two or three decades younger than Clavain’s, his slick backcombed black hair merely feathered by grey. He was muscular, but not to the point where it looked ridiculous. He wore narrow black trousers and a knee-length black gown cinched above his waist. His feet and chest were bare, and he stood before Clavain with his arms folded, looking down on him with an expression somewhere between amusement and mild disappointment. ‘I asked…’ the man began again. ‘You have obviously examined me,’ Clavain said. ‘What more can I tell you that you don’t already know?’ ‘You seem displeased.’ The man spoke Canasian, but with a trace of stiffness. ‘I don’t know who you are or what you want, but you have no idea of the damage you have done.’ ‘Damage?’ the man asked. ‘I was in the process of defecting to the Demarchists. But of course you know all that, don’t you?’ ‘I’m not sure how much Zebra told you,’ the man said. ‘It’s true we know something about you, but not as much as we’d like to know. That’s why you’re here now, as our guest.’ ‘Guest?’ Clavain snorted. ‘Well, that may be stretching the usual definition of the term, I admit. But I do not want you to consider yourself our prisoner. You are not. Nor are you our hostage. It is entirely possible that we will decide to release you very shortly. What harm will have been done then?’ ‘Tell me who you are,’ Clavain said. ‘I will in a moment. But first, why don’t you come with me? I think you will find the view most rewarding. Zebra told me this wasn’t your first visit to Chasm City, but I am not sure you’ll have ever seen it from quite this perspective.’ The man leaned down and offered Clavain his hand. ‘Come, please. I assure you I will answer all of your questions.’ ‘All of them?’ ‘Most of them.’ Clavain pushed himself from the iron seat with the man’s assistance. He realised that he was still a little weak, now that he had to stand on his own, but he was able to walk without difficulty, his own bare feet cold against the marble. He remembered that he had removed his shoes before getting into the Demarchist spacesuit. The man led him to one of the spiral staircases. ‘Can you manage this, Mr Clavain? It’s worth it. The windows are a little dusty below.’ Clavain followed the man up the rickety spiral staircase until they reached one of the aerial walkways. It wound its way through panes of trelliswork until Clavain lost all sense of direction. From the vantage point of his seat he had been aware only of indistinct shapes beyond the windows and a pale ochre light that suffused everything with its own melancholic glow, but now he saw the view more clearly. The man ushered him to a balustrade. ‘Behold, Mr Clavain: Chasm City. A place I have to come to know and, while not actually love, perhaps not to detest with quite the same missionary zeal as when I first arrived.’ ‘You’re not from here?’ Clavain asked. ‘No. Like you I have travelled far and wide.’ The city crawled away in all directions, festering into a distant urban haze. There were not more than two dozen buildings taller than the one they were in, although some of those were very much taller, plunging into overlying cloud so that their tops were invisible. Clavain saw the dark, distant line of the encircling rim wall looming over the haze many tens of kilometres away. Chasm City was built inside a caldera which itself contained a gaping hole in Yellowstone’s crust. The city surrounded the great belching chasm, teetering on the edge, thrusting clawlike taplines down into the depths. Structures leaned shoulder to shoulder, intertwined and fused into deliriously strange shapes. The air was infested with aerial traffic, a constant shifting mass that made the eye struggle to stay in focus. It seemed quite impossible that there could be that many journeys to be made at any one time, that many vital errands and deputations. But Chasm City was vast. The aerial traffic represented a microscopic portion of the real human activity taking place beneath the spires and towers, even in wartime. It had been different, once. The city had seen three approximate phases. The longest had been the Belle Époque , when the Demarchists and their presiding families had held absolute power. Back then the city had sweltered under the eighteen merged domes of the Mosquito Net. All the power and chemistry that the city needed had been drawn from the chasm itself. Within the domes, the Demarchists had pushed their mastery of matter and information to its logical conclusion. Their longevity experiments had given them biological immortality, while the regular downloading of neural patterns into computers had made even violent death no more than a nuisance. Their expertise with what some of them still quaintly termed ‘nanotechnology’ had enabled them to reshape their environments and bodies almost at will. They had become protean, a people for whom stasis of any kind was abhorrent. The city’s second phase had come only a century ago, with the emergence of the Melding Plague. The plague had been very democratic, attacking people as eagerly as it attacked buildings. Belatedly, the Demarchists had realised that their Eden had always held a particularly vicious serpent. Until then the changes had been harnessed, but the plague ripped them from human control. Within a few months the city had been utterly transformed. Only a few hermetic enclaves existed where people could still walk around with machines in their bodies. The buildings contorted into mocking shapes, reminding the Demarchists of what they had lost. Technology had crashed back to an almost pre-industrial state. Predatory factions stalked the city’s lawless depths. Chasm City’s dark age lasted nearly forty years. It was a matter of debate whether the city’s third state had already ended or was still continuing under different stewardship. In the immediate aftermath of the plague, the Demarchists had lost most of their former sources of wealth. Ultras took their trade elsewhere. A few high families struggled on, and there were always pockets of financial stability in the Rust Belt, but Chasm City itself was ripe for economic takeover. The Conjoiners, confined until then to a few remote niches throughout the system, had seen their moment. It was not an invasion in the usual sense. They were too few in number, too militarily weak, and they had no wish to convert the populace to their mode of thinking. Instead they had bought out the city a chunk at a time, rebuilding it into something glittering and new. They tore down the eighteen merged domes. In the chasm they installed a vast item of bioengineered machinery called the Lilly, which vastly increased the efficiency of chemical conversion of the chasm’s native gases. Now the city lived in a pocket of warm breathable air, sustained by the Lilly’s slow exhalations. The Conjoiners had torn down many of the warped structures, replacing them with elegant bladelike towers that reached far above the breathable pocket, turning like yacht’s sails to minimise their wind profile. More resilient forms of nanotechnology were cautiously introduced back into the environment. Conjoiner medicines allowed longevity therapies to be pursued again. Sniffing prosperity, Ultras again made Yellowstone a key stopover on their trade intineraries. Around Yellowstone, resettlement of the Rust Belt proceeded apace. It should have been a new Golden Age. But the Demarchists, the city’s former masters, never adjusted to the role of historical has-beens. They chafed at their reduced status. For centuries they had been the Conjoiners’ only allies, but all that was about to end. They would go to war to win back what they had lost.