Puzzled, Burton and Swinburne crossed to the tall inner doors, which were standing slightly open, and entered the station’s vast cathedral-like interior. It was filled with machines whose function could only be guessed at. They pumped and hammered and sizzled and buzzed while, overhead, in glass spheres suspended from the distant ceiling, lightning flashed without surcease, casting a harsh light over the scene.

The two men followed a passage through the various contraptions until they came to an area that was filled with workbenches. Normally, this part of the station was crowded with engineers and scientists, all labouring night and day over their creations, but now it was empty but for a small group of men and women among whom Burton spotted Babbage, Gooch, and Brunel. The latter was so utterly motionless that he resembled a statue.

Isambard Kingdom Brunel was a remarkable figure. No longer human, he stood there, a hulking man-shaped contraption, comprised of armour-like brass plating, rods, springs, pistons, and cogwheels, and etched all over with intricate decorative designs. He had six arms—one with a big Gatling gun bolted to it—and a mask-like face fashioned into a likeness of the human features he’d possessed until his death last year. The electrical fields of his conscious mind were stored in fragments of a Nāga diamond and were articulated through one of Babbage’s famous probability calculators housed in his metal skull.

As they came closer, Burton saw that one of the great engineer’s hands had been cleanly shorn off at the wrist. He also saw a workbench upon which the pristine time suit—the one Abdu El Yezdi had taken from Edward Oxford in 1840—had been laid out. Beside it, an oblong box-like contraption was hanging by long chains from the ceiling. Constructed from dark wood and polished brass, it somewhat resembled a curve-topped sea chest. Its upper surface was inset with dials, switches, and gauges. On the other side of this box, in an area that looked as if it should have been occupied by another workbench, there was a circular smooth-sided bowl-shaped depression in the floor. Though considerably smaller, it exactly resembled the one left in the paving at Leicester Square after Spring Heeled Jack had vanished.

Burton felt his skin prickling with a disconcerting presentiment.

“By God, what happened to you?” Daniel Gooch exclaimed upon spotting the king’s agent. “You look like you lost an argument with an omnibus.”

“Something like that,” Burton said. He looked at Brunel. “Isambard?”

Gooch, a short, plumpish, sandy-haired man who, as usual, was wearing a harness to which was attached a pair of mechanical arms supplementing his own, extended all four limbs in a wide shrug. “You’ll not get anything out of him, I’m afraid. I think his babbage calculator has been knocked out of whack. He’s completely paralysed. We’ve had an—er—incident.” He turned and called to Charles Babbage. The aged scientist, though stooped and liver spotted, had about him an air of zealous energy that belied his years. That energy was currently being expended in frenetic pacing. He was also tapping the fingers of both hands against his forehead, as if pressing imaginary buttons.

“Charles! Charles!” Gooch repeated. “Sir Richard and Mr. Swinburne are here.”

“Irrelevant!” Babbage snapped.

“I hardly think so, sir. The suit belonged to Sir Richard, after all.”

“Belonged?” Burton queried.

“The damaged one,” Swinburne said. “Where is it?”

“Ah,” Gooch answered. “That’s the question.”

“Not one we should be required to ask,” Babbage shouted in a querulous tone. “It shouldn’t be possible. Even if it had become functional, there was no one inside the blasted thing to command it. What could have instigated it to jump?”

Burton struggled to clarify his thoughts. The Saltzmann’s was sending wave after wave of heat through him, flushing out the pain of his wounds, but also causing his mind to apprehend a plethora of variations, so that when Babbage turned to face him, he was also dimly aware of the old man not turning to face him, and when Babbage raised his right hand with his forefinger pointing upward, Burton imagined or vaguely perceived—he wasn’t certain which—the scientist raising the left instead.

“Nine o’clock on the fifteenth of February, 1860,” Babbage announced. “Does that moment mean anything to you?”

“I’m aware that it is today’s date,” Burton responded. “And the hour of nine has made itself significant.”

“Ah! So you recognise the anniversary?”

Burton removed his top hat, shook snow from it, and placed it on a worktop. He put his cane beside it and started to unbutton his coat. “I don’t, Charles. Enlighten me.”

Babbage slapped his right fist into his left palm. “Edward Oxford! It is at nine o’clock on the fifteenth of February in the year 2202—his fortieth birthday—that he’ll make his first foray into the past; departing his native time period at that precise moment, exactly three hundred and forty-two years from now.”

Stepping to a wooden stool, Burton lowered himself onto it, feeling his injured arm complaining but experiencing the pain as a somehow disassociated flare of light that didn’t properly belong to him.

Swinburne, who’d also divested himself of his outer garments, said, “What of it, Charles?”

“Have you not read the reports Abdu El Yezdi left for us? Did he not always insist that coincidences are of crucial importance? He referred to time as having echoes and rhythms, ripples and interconnected moments. In truth, what he was clumsily expressing are matters of algorithmic probability. They cannot be ignored.”

“An anniversary strikes me as more a matter of sentiment than of mathematics,” Swinburne said.

“You are a poet, sir!” Babbage spat the word as if it were the worst insult in the world.

Burton addressed Gooch. “Have you a cigar, old fellow? I appear to have smoked my last.”

Gooch dug mechanical fingers into his pocket and passed a Flor de Dindigul to the king’s agent.

“Thank you.” After putting a flame to his smoke, Burton returned his attention to Babbage. “I take it you marked the occasion in some manner.” He gestured toward the indentation in the floor. “And perhaps that is the result?”

“It doesn’t make any sense.”

“What doesn’t?”

Babbage started tapping his head again. “Nothing to provide the impulse, you see,” he muttered. “No one in it.”

“I don’t see.” Burton turned to Gooch. “In plain English and to the point, please, Daniel.”

The engineer grunted and said, “I’ll try.” He folded his four arms. “It concerns the multitude of histories. They must all contain Edward Oxford’s burned and malfunctioning time suit because they all originated either from the moment he caused the first division in time or from events that occurred subsequent to it. However, our iteration of history is absolutely unique in that Abdu El Yezdi brought to it a second version of the outfit.” He nodded toward the nearby bench. “The undamaged one. That’s what made Charles’s experiment possible.”

“Two suits. Where is the other?”

“We don’t know. Charles was attempting to repair it.” Gooch strode over to the bench. “The suit is comprised of four principal components.” He put a metal hand against the white fabric. “Its material absorbs light and converts it to power.” He touched the flat disk on the suit’s chest. “The Nimtz generator stores that power and converts it to what we might refer to as chronostatic energy.” He moved to the end of the worktable. “Immediately prior to the suit’s transference from one moment in history to another, the generator extends around it a pocket of the aforesaid energy. Were this to intersect with anything possessing more density than air, the object would be sliced through and part of it carried with the traveller through time. The boots, with their spring-loaded stilts, were therefore designed to thrust Oxford high above the ground so only the atmosphere surrounded him.” He waved a fleshy hand toward the other end of the bench. “Finally, the helmet contains microscopic semi-biological machinery that calculates, initiates, and directs all aspects of the journey. The crucial constituent of this machinery is called a BioProc. One word, capital B, capital P. There are thousands of BioProcs in the helmet, and every one of them contains a granule of powdered black diamond. Larger shards of the stone are also present in the generator. We are all aware of the peculiar qualities of the gem, yes?”