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  It had enchanted her. She had remade the prototype, adding a few sly refinements of her own. But though the machine had provided some amusement, she had seen only glimpses of emergent behaviour. The machine was too ruthlessly deterministic to throw up any genuine surprises.

  Hence the mice. They were random agents, chaos on legs. She had concocted the new machine to exploit them, using their unpredictable scurrying to nudge it from state to state. The complex systems of levers and switches, trapdoors and junctions ensured that the maze was constantly mutating, squirming through phase-space — the mind-wrenching higher-dimensional mathematical space of all possible configurations that the maze could be in. There were attractors in that phase-space, like planets and stars dimpling a sheet of space-time. When the maze fell towards one of them it would often go into a kind of orbit, oscillating around one state until something, either a build-up of instability or an external kick, sent it careering elsewhere. Usually all that was needed was to tip a new mouse into the maze.

  Occasionally, the maze would fall towards an attractor that caused the mice to be rewarded with more than the usual amount of food. She had been curious as to whether the mice — acting blindly, unable to knowingly co-operate with each other — would nonetheless find a way to steer the maze into the vicinity of one of those attractors. That, if it happened, would surely be a sign of emergence.

  It had happened, once. But that batch of mice had never repeated the trick since. Felka had tipped more mice into the system, but they had only clogged up the maze, locking it near another attractor where nothing very interesting happened.

  She had not completely given up on it. There were still subtleties of the maze that she did not fully understand, and until she did it would not begin to bore her. But at the back of her mind the fear was already there. She knew, beyond any doubt, that the maze could not fascinate her for very much longer.

  The maze clicked and clunked, like a grandfather clock winding up to strike the hour. She heard the shutterlike clicking of doors opening and closing. The details of the maze were difficult to see behind the glass, but the flow of the mice betrayed its shifting geometry well enough.

  ‘Felka?’

  A man forced his way through the connecting throat. He floated into the room, arresting his drift with a press of fingertips against polished wood. She could see his face faintly. His bald skull was not quite the right shape. It seemed even odder in the gloom, like an elongated grey egg. She stared at it, knowing that, by rights, she should always have been able to associate that face with Remontoire. But had six or seven men of about the same physiological age entered the room, possessing the same childlike or neotenous facial features, she would not have been able to pick Remontoire out from them. It was only the fact that he had visited her recently that made her so certain it was him.

  ‘Hello, Remontoire.’

  ‘Could we have some light, please? Or shall we talk in the other chamber?’

  ‘Here will do nicely. I’m in the middle of running an experiment.’

  He glanced at the glass wall. ‘Will light spoil it?’

  ‘No, but then I wouldn’t be able to see the mice, would I?’

  I suppose not,‘ Remontoire said thoughtfully. ’Clavain’s with me. He’ll be here in a moment.‘

  ‘Oh.’ She fumbled one of the lanterns on. Turquoise light wavered uncertainly and then settled down.

  She studied Remontoire’s expression, doing her best to read it. Even now that she knew his identity, it was not as if his face had become a model of clarity. Its text remained hazy, full of shifting ambiguities. Even reading the commonest of expressions required an intense effort of will, like picking out constellations in a sprinkling of faint stars. Now and then, admittedly, there were occasions when her odd neural machinery managed to grasp patterns that normal people missed entirely. But for the most part she could never trust her own judgement when it came to faces.

  She bore this in mind when she looked at Remontoire’s face, deciding, provisionally, that he looked concerned. ‘Why isn’t he here now?’

  ‘He wanted to give us time to discuss Closed Council matters.’

  ‘Does he know anything about what happened in the chamber today?’

  ‘Nothing.’

  Felka drifted to the top of the maze and popped another mouse into the entrance, hoping to unblock a stalemate in the lower-left quadrant. ‘That’s the way it will have to continue, unless Clavain assents to join. Even then he may be disappointed at what he doesn’t get to know.’

  I understand why you wouldn’t want him to know about Exordium,‘ Remontoire said.

  ‘What exactly is that supposed to mean?’

  ‘You went against Galiana’s wishes, didn’t you? After what she discovered on Mars she discontinued Exordium. Yet when you returned from deep space — when she was still out there — you happily participated.’

  ‘You’ve become quite an expert all of a sudden, Remontoire.’

  ‘It’s all there in the Mother Nest’s archives, if you know where to look. The fact that the experiments took place isn’t much of a secret at all.’ Remontoire paused, watching the maze with mild interest. ‘Of course, what actually happened in Exordium — why Galiana called it off — that’s another matter entirely. There’s no mention in the archives of any messages from the future. What was so disturbing about those messages that their very existence couldn’t be acknowledged?’

  ‘You’re just as curious as I was.’

  ‘Of course. But was it just curiosity that made you go against her wishes, Felka? Or was there something more? An instinct to rebel against your own mother, perhaps?’

  Felka held back her anger. ‘She wasn’t my mother, Remontoire. We shared some genetic material. That’s all we had in common. And no, it wasn’t rebellion either. I was looking for something else to engage my mind. Exordium was supposed to be about a new state of consciousness.’

  ‘So you didn’t know about the messages either?’

  ‘I had heard rumours, but I didn’t believe them. The easiest way to find out for myself seemed to be to participate. But I didn’t start Exordium again. The programme had already been resurrected before our return. Skade wanted me to join it — I think she thought the uniqueness of my mind might be of value to the programme. But I only played a small part in it, and I left almost as soon as I had begun.’

  ‘Why — because it didn’t work the way you’d hoped?’

  ‘No. As a matter of fact it worked very well. It was also the most terrifying thing I’ve ever experienced in my life.’

  He smiled at her for a moment; then his smile slowly vanished. ‘Why, exactly?’

  ‘I didn’t believe in the existence of evil before, Remontoire. Now I’m not so certain.’

  He spoke as if he had misheard her. ‘Evil?’

  ‘Yes,’ she said softly.

  Now that the subject had been raised she found herself remembering the smell and texture of the Exordium chamber as if it had been only yesterday, even though she had done all she could to steer her thoughts away from that sterile white room, unwilling to accept what she had learned within it.

  The experiments had been the logical conclusion to the work Galiana had initiated in her earliest days in the Martian labs. She had set out to enhance the human brain, believing that her work could only be for the greater good of humanity. As her model, Galiana used the development of the digital computer from its simple, slow infancy. Her first step had been to increase the computational power and speed of the human mind, just as the early computer engineers had traded clockwork for electromechanical switches; switches for valves; valves for transistors; transistors for microscopic solid-state devices; solid-state devices for quantum-level processing gates which hovered on the fuzzy edge of the Heisenberg uncertainty principle. She invaded the brains of her subjects, including herself, with tiny machines that laid down connections between brain cells which exactly paralleled those already in place, but which were capab
le of transmitting nerve signals much more rapidly. With the normal neurotransmitter and nerve-signal events inhibited by drugs or more machines, Galiana’s secondary loom took over neural processing. The subjective effect was normal consciousness, but at an accelerated rate. It was as if the brain had been supercharged, able to process thoughts at a rate ten or fifteen times faster than an unaugmented mind. There were problems, enough to ensure that accelerated consciousness could not usually be sustained for more than a few seconds, but in most respects the experiments had been successful. Someone in the accelerated state could watch an apple fall from a table and compose a commemorative haiku before it reached the ground. They could watch the depressor and elevator muscles flex and twist in a hummingbird’s wing, or marvel at the crownlike impact pattern caused by a splashing drop of milk. They also, needless to say, made excellent soldiers.

  So Galiana had moved on to the next phase. The early computer engineers had discovered that certain classes of problem were best tackled by armies of computers locked together in parallel, sharing data between nodes. Galiana pursued this aim with her neurally enhanced subjects, establishing data-corridors between their minds. She allowed them to share memories, experiences, even the processing of certain mental tasks such as pattern recognition.

  It was this experiment running amok — jumping uncontrolled from mind to mind, subverting neural machines which were already in place — that led to the event known as the Transenlightenment and, not inconsequentially, to the first war against the Conjoiners. The Coalition for Neural Purity had wiped out Galiana’s allies, forcing her back into the seclusion of a small fortified huddle of labs tucked inside the Great Wall of Mars.

  It was there, in 2190, that she had met Clavain for the first time, when he had been her prisoner. It was there that Felka had been born, a few years later. And it was there that Galiana pushed on to the third phase of her experimentation. Still following the model of the early computer engineers, she now wished to explore what could be gained from a quantum-mechanical approach.

  The computer engineers in the late twentieth and early twenty-first centuries — barely out of the clockwork era, as far as Galiana was concerned — had used quantum principles to crack problems that would otherwise have been insoluble, such as the task of finding the prime factors of very large numbers. A conventional computer, even an army of conventional computers sharing the task, stood no chance of being able to find the prime factors before the effective end of the universe. And yet with the right equipment — an ungainly lash-up of prisms, lenses, lasers and optical processors on a lab bench — it was possible to do it in a few milliseconds.

  There had been fierce debate as to exactly what was happening, but not that the primes were being found. The simplest explanation, which Galiana had never seen any reason to doubt, was that the quantum computers were sharing the task between infinite copies of themselves, spread across parallel universes. It was conceptually staggering, but it was the only reasonable explanation. And it was not something they had plucked out of thin air to justify a perplexing result; the idea of parallel worlds had long been at least one conceptual underpinning of quantum theory.

  And so Galiana had tried to do something similar with human minds. The Exordium chamber was a device for coupling one or more augmented brains to a coherent quantum system: a bar of magnetically suspended rubidium that was being continually pumped into cycles of quantum coherence and collapse. During each episode of coherence the bar was in a state of superposition with infinite counterparts of itself, and it was at this moment that a neural coupling was attempted. The act itself always forced the bar to collapse down to one macroscopic state, but the collapse was not instantaneous. There was a moment when some of the bar’s coherence bled back into the linked minds, putting them into weak superposition with their own parallel-world counterparts.

  In that moment, Galiana hoped that there might be some perceptible change in the experienced consciousness state of the participant. Her theories, however, did not say what that change might be.

  It was, in the end, nothing like she had expected.

  Galiana had never spoken to Felka about her detailed impressions, but Felka had learned enough to know that her own experience must have been broadly similar. When the experiment began, with the subject or subjects lying on couches in the chamber, their heads swallowed in the gaping white maws of high-resolution neural interfacing trawls, there was a presentiment, like the aura that warned of an impending epileptic seizure.

  Then there would come a sensation that Felka had never been adequately able to describe outside of the experiment. All she could say was that her thoughts suddenly became plural, as if behind every thought she detected the faint choral echo of others that almost perfectly shadowed it. She did not sense an infinity of such thoughts, but she did sense, faintly, that they receded into something, diverging at the same time. She was, in that moment, in touch with counterparts of herself.

  Then something far stranger would begin to happen. Impressions would gather and solidify, like the phantoms that take shape after hours of sensory deprivation. She became aware of something stretching ahead of her, into a dimension she could not quite visualise but which nonetheless conveyed a tremendous sense of distance and remoteness.

  Her mind would grasp at the vague sensory clues and throw some kind of familiar framework over them. She would see a long white corridor stretching towards infinity, washed out in bleak colourless light, and she would know, without being able to articulate quite how she knew, that what she was seeing was a corridor into the future. Numerous pale doors or apertures, each of which opened into some more remote future epoch, lined the corridor. Galiana had never intended to open a door into that corridor, but it seemed that she had made it possible.

  Felka sensed that the corridor could not be traversed; one could only stand at its end and listen for messages that came down it.

  And there would be messages.

  Like the corridor itself they were filtered through her own perceptions. It was impossible to say from how far in the future they had come, or what exactly the future that had sent them looked like. Was it even possible for a particular future to communicate with the past without causing paradoxes? In trying to answer this, Felka had come across the nearly forgotten work of a physicist named Deutsch, a man who had published his thoughts two hundred years before Galiana’s experiments. Deutsch had argued that the way to view time was not as a flowing river but as a series of static snapshots stacked together to form space-times in which the flow of time was only a subjective illusion. Deutsch’s picture explicitly permitted past-directed time travel with the preservation of free will and yet without paradoxes. The catch was that a particular ‘future’ could only communicate with the ‘past’ of another universe. Wherever these messages were coming from, they were not from Galiana’s future. They might be from one that was very close to it, but it would never be one she could reach. No matter. The exact nature of the future was less important than the content of the messages themselves.

  Felka had never learned the precise content of the messages Galiana had received, but she could guess. They had probably been along the same lines as the ones that came through during Felka’s brief period of participation.

  They would be instructions for making things, clues or signposts that pointed them in the right direction rather than detailed blueprints. Or there would be edicts or warnings. But by the time those distant transmissions had reached the participants in the Exordium experiments, they had been reduced to half-heard echoes, corrupted like Chinese whispers, intermingled and threaded with dozens of intervening messages. It was as if there was only one open conduit between the present and the future, with a finite bandwidth. Every message sent reduced the potential capacity for future messages. But it was not the actual content of the messages that was alarming, rather the thing that Felka had glimpsed behind them.

  She had sensed a mind.

  ‘We touched something,�
� she told Remontoire. ‘Or rather something touched us. It reached down the corridor and grazed against our minds, coming through at the same time as we received the instructions.’

  ‘And that was the evil thing?’

  I can’t think of any other way to describe it. Merely encountering it, merely sharing its thoughts for an instant, drove most of us insane, or left us dead.‘ She looked at their reflections in the glass wall. ’But I survived.‘

  ‘You were lucky.’

  ‘No. It wasn’t luck. Not entirely. Just that I recognised the thing, so the shock of encountering it wasn’t so absolute. And because it recognised me, too. It withdrew as soon it touched my mind, and concentrated on the others.’

  ‘What was it?’ Remontoire asked. ‘If you recognised it…’

  ‘I wish I hadn’t. I’ve had to live with that moment of recognition ever since, and it hasn’t been easy.’

  ‘So what was it?’ he persisted.

  ‘I think it was Galiana,’ Felka said. ‘I think it was her mind.’

  ‘In the future?’

  ‘In a future. Not ours, or at least not precisely.’

  Remontoire smiled uneasily. ‘Galiana’s dead. We both know that. How could her mind have spoken to you from the future, even if it was a slightly different one from ours? It can’t have been that different.’

  ‘I don’t know. I wonder. And I keep wondering how she became like that.’

  ‘And that’s why you left?’

  ‘You’d have done the same thing.’ Felka watched the mouse take a wrong turning; not the one she had hoped it would take. ‘You’re angry with me, aren’t you? You feel that I betrayed her.’

  ‘Irrespective of what you’ve just told me, yes. I suppose I do.’ His tone had softened.