“War? My God. So what is it, this diamond? Why is it so important? What's it got to do with Spring Heeled Jack?”

“Are you familiar with the fabled Naga?” Burton asked.

Monckton Milnes furrowed his brow. “I-yes-I believe-I believe I've come across references to them in various occult texts. Weren't they some sort of pre-human race?”

“Yes. There are carvings of them at Angkor Wat. They are portrayed as seven- or five-headed reptiles.”

“So?”

“When this planet was young, an aerolite-a huge black diamond-broke into three pieces in its atmosphere. One piece fell to Earth in what became South America, another in Africa, and the last in the Far East. The Naga built civilisations around the impact sites. They discovered that the diamonds possessed a very special property: they could store and maintain even the most subtle of electrical fields, such as those generated by a living brain. The Naga used them to fuse their minds, to form a sort of unified intelligence.”

“If any of that is true, how can you possibly know it?”

“That will become apparent,” Burton responded. He went on speaking in a low and urgent tone: “The human race waged war on the Naga, and the reptiles became extinct. The diamonds were lost until, in 1796, Sir Henry Tichborne discovered one-the South American stone.”

“Tichborne!”

“Indeed. He brought it home and hid it beneath his estate. In the history that was meant to be, it remained there until just prior to the future Edward Oxford's time, when it was discovered after Tichborne House was demolished. Oxford cut small shards from it and used them in the machinery of his time suit. When he arrived in the past, those shards suddenly existed in two places at once. They were in his suit and they were also still a part of the diamond under the estate. This paradox caused a strange resonance between them, which extended even to the two as yet undiscovered Naga diamonds. It caused them all to emit a low, almost inaudible musical drone. This led to the recovery of the Far Eastern stone, in Cambodia, which had been shattered into seven pieces when the humans conquered the Naga many millennia ago.”

“My head is spinning,” Monckton Milnes murmured.

“Not just yours,” Burton said. “The resonance also awoke a hitherto dormant part of the human mind. It made mediumistic abilities possible. Thus Countess Sabina, and thus a Russian named Helena Blavatsky.”

“The woman they say destroyed the Rakes last year?”

“Quite so. She stole two of the Cambodian stones and used them to peer into the future.”

“Which future-ours or the other one?”

“Ours. And in that future, in the year 1914, another Russian, a clairvoyant named Grigori Rasputin, was gazing back at us.”

“Why?”

“Because he foresaw that the Great War, which was in his time raging, would lead to his assassination and the decimation of his beloved Russia. He came looking for the events that sparked off the conflict, and he found them here, in the 1860s.”

Monckton Milnes regarded his friend through slitted eyes. “Are you referring to our role in the American hostilities?”

“No. The world war will pitch us against united German states, so I'm of the opinion that the recent Eugenicist exodus to Prussia, which was led by the botanist Richard Spruce and my former partner John Speke, might be the spark that lights the flame.”

“So this Rasputin fellow observed the defectors at work? To what end?”

“He did much more than that. He possessed Blavatsky and used her to steal the rest of the Cambodian stones and recover the South American diamond from the Tichborne estate, thus changing history again. He then employed them to magnify and transmit his mesmeric influence, causing the working classes to riot. He intended nothing less than the wholesale destruction of the British Empire, so that United Germany might win the war against us without Russian assistance. Once that heinous outcome was achieved, Russia would swoop upon a weakened Germany and defeat her.”

“Bloody hell!”

“Blavatsky didn't survive and the plot failed,” Burton said. “I caused Rasputin to die in 1914, two years before his assassination, meaning that history has diverged yet again, although that particular bifurcation won't occur for another fifty-one years.”

Monckton Milnes flexed his jaw. He clenched his fists. He blew out a breath, reached for his glass, emptied it, and refilled it again. He was trembling. “By thunder!” he muttered. “I actually believe all this! Where are the Cambodian and South American diamonds now?”

“The South American stone was broken into seven fragments when I defeated Rasputin. They are in Palmerston's possession. The Cambodian stones are embedded in a babbage probability calculator.”

“They are? For what purpose?”

“During the Tichborne riots I was assisted by a philosopher named Herbert Spencer. He died with the stones in his pocket and his mind was imprinted onto them. Charles Babbage had designed a device to process just such an imprint. We fitted the diamonds into it and placed the mechanism in my clockwork valet. Herbert Spencer thus lives on, albeit in the form of a mechanical contraption. That is how I know the history of the Naga, for the reptile intelligence remains in the stones, and Herbert can sense it. Actually, so can I, in a vague way. The Naga came to me in a dream and left me with the phrase ‘Only equivalence can lead to destruction or a final transcendence.’ It was that which guided me in the final ruination of Rasputin.”

Monckton Milnes again rubbed his face and again smudged his Harlequin makeup.

“So only the African diamond remains undiscovered and Palmerston is sending you to find it?”

“Precisely. As the last remaining unbroken stone, it will be more powerful than its splintered counterparts. He means to use the Eyes to wage a clandestine war on Prussia through clairvoyance, prophecy, and mediumistic assassinations. He intends that Bismarck will never unite the Germanic states. Do you see now why I'm wishing this expedition had never been commissioned?”

He received a weak nod of understanding. “Yes,” came the whispered response. “You can't possibly allow Palmerston that kind of power. By God, he could manipulate the whole world!”

“Just as Darwin and Galton and their cronies would have done.”

Monckton Milnes gazed at his friend a moment. “By James, I wouldn't be in your shoes for anything, Richard. What are you going to do?”

Burton shrugged. “I have to retrieve the stone if only to prevent it from falling into Prussian hands. I feel certain that my erstwhile partner is going after it, with Bismarck's sponsorship. As to what I'll do with it once I have it-I don't know. There's a further complication: it was the African Eye that Rasputin employed in 1914 to probe into the past. So I already know I'm fated to find it, and, after I do, it will somehow, eventually, be transported to Russia.”

They sat in silence for a few minutes, then Burton muttered, “I feel like a bloody pawn in a game of chess.”

Monckton Milnes roused himself from the reverie he'd fallen into. “I have every faith in you, Richard,” he said. “Go to Africa. Do whatever you must. You'll find an answer, of that I'm certain.”

Burton sighed and gave a slight jerk of his head. He became conscious of the buzz of conversation and merriment that filled Fryston. He looked down at himself, then at his friend, and suddenly chuckled. “Bismillah! King Shahryar of A Thousand Nights and a Nightdiscussing fantastic notions with Harlequin! What a confounded joke!”

Monckton Milnes smiled. “Go back to the party. Relax. Enjoy yourself. I'll join you in a few minutes. I want to sit here a little longer.”

Burton rose and crossed to the door. He looked back and said, “If Palmerston learns that we had this conversation, I'll be thrown into the Tower.”