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‘I ought to get back to it.’ Petrie pushed back his chair.

Shtyrkov was heaping Georgian caviar thickly on to flat bread. ‘Tom, bypass a thirty-year learning curve by absorbing the following truth, from Ecclesiasticus chapter 38, I think: “A scholar’s wisdom comes of ample leisure.” Did Plato rush to catch a bus? Was Socrates ever twitching to get back to his computer terminal? My chicken tabaka is flattened, fried, crisp and juicy, and it is ready. Ready, that is, to serve with a prune sauce, sour cream and red pickled cabbage. Now, do you propose to insult me by refusing my laboriously prepared feast?’

‘If you put it that way.’

There was a bright flash, and this time the rumble of thunder was closer.

Freya spoke firmly. ‘Look at you, Tom. You can hardly keep your eyes open. When we’ve eaten, I’m taking you to bed.’

Petrie thought that Freya’s command of English was probably less than perfect.

* * *

Petrie needed sleep. He had to lie down, put his head on a pillow, shut his eyes and sleep.

Freya, it seemed, had adopted the role of a surrogate mother. After Shtyrkov’s main course — a squashed chicken rather than a squashed octopus — exhaustion had overcome Petrie to the point where he could hardly stand up. Freya had taken him by the arm and led him up the stairs. Even in his exhausted state he had enjoyed the warmth, the scent, the animal femininity of this young Norwegian woman. She had gently eased him into his room and wished him a good night.

He threw off his clothes, pulled down the blankets and flopped.

But the blizzard was still swirling. Petrie could see it in the ceiling, and on the walls, and in all the dark corners of his room.

This was different from Bletchley.

In war, strenuous efforts were made to veil the message. Victory and defeat in battle, and even the outcome of a war, might nowadays depend as much on a contest between distant mathematicians as it once did between armies. If the Germans had known about Bletchley, they might have changed the course of the war with a single bombing raid. But if Shtyrkov’s lunatic conjecture was right, nobody would be trying to hide anything. On the contrary, the signallers would be trying to communicate.

Even so, Petrie thought, his mind whirling, exhausted but unable to stop, how can they judge the mental level of the people they’re trying to reach? He could still be an ape trying to understand a Fortran computer program.

He heard Freya’s door closing next to him, visualised her taking her clothes off, sliding naked between sheets, just a few feet away.

As he drifted off, rain began to batter against the window. And once again Sampson-Kildare, the old horror, was croaking:

‘The wind blew as ’twad blawn its last; The rattling showers rose on the blast; The speedy gleams the darkness swallow’d; Loud, deep and lang the thunder bellow’d: That night, a child might understand, The De’il had business on his hand.’

And now Sampson-Kildare was high on a ledge in the big cavern, shooting bullets through the lake. He paused to reload his machine gun, but only for a microsecond. The next burst of fire was somehow different from the one before. And then another tiny time gap, and another surge of bullets.

And the bullets were going through the lake faster than light and the lake was glowing and Sampson-Kildare was saying that’s because the eye can’t see flickering faster than a fiftieth of a second in duration, and he was sometimes firing millions of bullets through the lake in a microsecond, and at other times he was smoking and firing only a few thousands at a time.

And the bullet patterns were sometimes filling just one patch of the lake, or sweeping round it like a searchlight.

And yet not like a searchlight. It was more of a corkscrew or spiralling motion.

No, more like two searchlights, counter-rotating. And now there were two machine-gunners, the surface of the lake spitting as the stream of bullets danced around each other like a gunfighter’s ballet, and Sampson-Kildare was leaping around grotesquely on the ledge and croaking:

‘As Tammie glower’d, amaz’d, and curious, The mirth and fun grew fast and furious; The piper loud and louder blew, The dancers quick and quicker flew, They reel’d, they set, they cross’d, they cleekit…’

BANG!

Rattling windows; a flash of light penetrating his eyelids. Petrie wakened with a gasp, staring into the dark. Heavy rain was battering on his window.

Impossible! Utterly impossible!

He threw back the blankets, groped for a light and dressed quickly. Shaking, he went out into the darkened corridor and felt his way along it. He could just make out the top of the marble stairs. Another flash momentarily lit them up and he descended cautiously, his eyes adapting to the dark. The headache had gone.

He hurried along to the theological library and groped for light switches. There were three of them and he switched them all on. He realised that he had left his computer running. To his relief, as he tapped at the keyboard, he found that the thunderstorm hadn’t affected it.

He looked again at the particle storm on his screen. Parallel lines, and yet, not just parallel lines. The particles didn’t like to crowd too close together. Petrie thought this might be down to their physics: maybe they repelled each other at short range or whatever. Nothing to do with aliens or similar rubbish.

There had always been a slightly mad streak running through Russian science. The Tunguska meteorite was a crashed flying saucer, or the innermost satellite of Mars was an ancient space station, crap like that. Maybe Shtyrkov was part of that tradition.

And in any case, order could be created out of chaos. Petrie thought there were maybe complicated force laws between the particles and that these forces had generated patterns during the long interstellar journey.

He rubbed his face with his hands and groaned with tiredness. Belousov and Zhabotinskii, more damned Russians. They’d mixed citric and sulphuric acids, added salts and chemicals, and within the mixture, as by a miracle, wonderful red-blue pulsations had appeared, and circular waves had come and gone, and spiral patterns had chased each other around the mixture. And it had all grown just from chaos, from the disequilibrium of the chemical mixture. They’d been beaten to their discovery by forty years, by William Bray, but his contemporaries hadn’t believed you could get chemical reactions to oscillate, hadn’t bothered to follow it up, and the man had died in obscurity, the Russians now collecting the kudos denied Bray by the idiocy of his colleagues.

Instead of looking at an indecipherable mass of lines, why not reduce each particle to a point? Imagine a flat surface, face-on to the flow, and record each particle’s point of intersection with the plate. Like a telescope pointing to the signal source.

That would take programming. Hell, the Earth’s rotation.

Svetlana!

He ran back through the corridors and up the stairs. One, two … seven doors along. He knocked sharply. The sound of a body stirring within. ‘Svetlana!’

A light switched on. Svetlana appeared, wearing an ankle-length yellow gown, curiosity and tiredness on her face.

‘I need help.’

‘What’s the time?’

‘I’ve no idea.’

She disappeared and reappeared in a moment, wearing sandals and putting her arms into the sleeves of a long, red cotton dressing gown. ‘It’s nearly two o’clock.’

He explained as they went. ‘The flow of particles. I need to see them face-on.’