“We will not speak of it!” Caroline announced; and here she really would have ordered his head to be struck off if any guards had been in earshot. Or done the deed with her own hand, given a sharp object. Her rage must have showed, for Daniel Waterhouse now raised his white eyebrows, elevated his chin, and spoke in a voice that was so soothing and gentle that it dissolved like sugar in the murmur of waves along the pool’s edge.

“You forget that I know Leibniz, and that through him I shared his sweet love for that Queen, and his grief. Grief and anger.”

“He thinks she was poisoned?” This was one of the few topics Leibniz refused to discuss with Caroline.

“The manner of her death is not as important as the consequence. If half of what people say about her is true, she had made Berlin into a Protestant Parnassus. Writers, musicians, and scientists converged on the Charlottenburg from every quarter. But she died. Quite recently her husband went to join her. Where the former King of Prussia amused himself by attending the opera, the new one plays with toy soldiers…I see amusement on your face, your royal highness. Familial affection, I think this must be, for this cousin of yours who adores parades and goose-stepping soldiers. But to those of us who do not share in the family joke, it is dreadfully serious. For the war is over; most of the great conflicts have been sorted out; Natural Philosophy has conquered the realm of the mind; and now-today-as we stand here-the new System of the World is being writ down in a great Book somewhere.”

“The System of the World-that is the title of the book we have anticipated for so many years from Sir Isaac Newton. A new volume of Principia Mathematica…or am I mistaken?”

“Indeed. But I refer to a different unfinished work: mine and yours. We have lost Sophie Charlotte, and with her we have lost Prussia. I do not wish to lose you, and lose Britain. Those are precisely the stakes.”

“But this is why I have sought you out in Massachusetts!” Caroline protested. “I cannot manage a house divided between partisans of Leibniz on the one hand, and of Newton on the other. As German and British dominions are united under one crown, so German and British philosophy must be brought together under a grand unification. And you, Doctor Waterhouse, are the one-”

But she was speaking into a cloud. Daniel Waterhouse had vanished. Caroline looked far up the path to see a crone storming towards her with a letter whipping back and forth in one hand.

Sophie as usual moved at the pace of a dragoon. But the garden was large. Caroline would have a few moments, yet, to collect herself. She turned toward the fountain, for if shock were still written on her face it were better that Sophie not read it. But all told, she was not as rattled by the conversation just finished as the average Continental princess might have been. For as long as she had been in Hanover, strange people had been coming over from England, bearing cryptic messages and making odd requests. None of it made much sense to her, since she’d never visited the place. She and George Augustus had been invited to come over by some people called Whigs-a challenging term for Germans to pronounce-but some other English called Tories were dead set against their coming. It was all academic anyhow, since George Louis had forbidden his son and daugher-in-law to leave.

High above her head, where the towering water-jet surrendered to gravity, Caroline could see clumps of water that somehow held together even as the rest of the flow shattered. These could be seen as dark streaks against the incoherent spray. But those water-clumps came down with much greater speed and force than the dissipating clouds, and as they fell, each broke apart into a shower of smaller lumps that left spreading comet-trails behind. Swarms and squadrons of these comets raced down to the pool, messengers carrying strange information from above.

She strolled round until she was very close to where most of the plume struck the pond. The spray made a solid white hiss and roar, and her dress grew heavy as it stole water from the air. She tried to follow the comets. When they smashed into the foaming surface of the pond they made indistinct noises, like individual voices trying to shout messages in the midst of the Mobb. But whatever intelligence the comets were carrying down from on high was swallowed up by the pool. When the bubbles burst and the froth died away, nothing was left but the clear water of the pond, a bit choppy from the breeze. Caroline supposed that the information was still there to be decyphered, if she’d only stand and stare into the pool long enough. But all she could make out was a constellation of yellow speckles on the stone floor of the pool.

“This cannot be a coincidence.”

“Good morning, Grandmama.”

Sophie was staring at the coins. At eighty-three she had no difficulty seeing them without glasses. She could even tell heads from tails, and recognize the portrait of Queen Anne stamped into the former.

“I see that bitch going and coming,” she remarked.

Princess Caroline said nothing.

“It is a symbol, a sign,” the Electress of Hanover announced, “planted here by one of those horrid visiting Englishmen.”

“What do you think it signifies?”

“That depends on what you think of the English money,” Sophie replied. “Which is the same thing as to ask, is it worth anything?”

This, being oddly similar to some remarks made moments ago by the horrid visiting Englishman in question, caused Caroline to look away from the coins, and gaze into Sophie’s face. In order to do this Caroline had to look slightly down, for Sophie had lost a few inches of height. She had the loose skin that one would expect in a woman of that age, but this had lent to her eyes a marvelous clarity. The walls of Herrenhausen and of the Leine Schlo? were adorned with old family portraits, not only of Sophie and her sisters but of their mother. These women stared out from the canvases with arched brows, enormous eyes, and tiny mouths, seeing much and saying little. They were certainly not the first girls in a salon that an insecure young man would approach, and engage in conversation. Now Caroline knew as well as anyone that portraits of royals must be taken with a grain of salt. But the visage she was regarding now did not look all that far removed from the ones in those paintings. The eyes, the mouth were the same. More so the feeling of self-possession, of completeness, the sense that this woman was by no means standing around waiting to be joined, or wishing that someone would talk to her. The only changes were in clothing. Sophie, though never responsive to fashion, had adopted the fontange, a tall vertical screen of white lace that rose from the hairline, added some inches to her height, and kept her thinning white hair out of view, and out of the way of those wonderful eyes.

Caroline had a funny thought then, which was that Sophie and Daniel Waterhouse might be a match for each other. For he had great staring eyes too, and a disposition to match Sophie’s. They could threaten to chop each other’s heads off well into the Eighteenth Century.

“Have you spoken to any of the English? I mean the ones who have just arrived, not of the Braithwaite type.”

“Briefly.”

“Come, I wish to be away from those coins, and that woman,” Sophie said, turning her back on the pool and leaning towards Caroline, knowing that she’d find a strong arm there. The two women clasped together like halves of a locket and began to walk away from the pool’s rim. Sophie steered Caroline firmly in the direction she wanted. But she had nothing further to say for a little while.

This half of the garden was partitioned into quadrants, each of which was laid out around a fountain much smaller than the great one in the center. Small paths radiated from each of those fountains, sectioning each quadrant into several pie-wedges. Each of those wedges-thirty-two all told-had been made into a little garden-plot, and each was a bit different: some as clean and tidy as parlours, others as dark and overgrown as the Thuringer Wald. Sophie steered Caroline to one that was screened by a high wall of trimmed trees. Passing through a gap they found themselves in a pleasant green atrium with a little pool in the center, and stone benches around it. Sophie let it be known that she wished to sit on one of these-unusual since for her, a walk in the garden was precisely that.