"I REGRET THAT I missed the funeral of Sophie," said Baron Gottfried Wilhelm von Leibniz. He had been on English soil for about an hour. Leibniz had never been precisely handsome, and never would be. But in the years since Daniel had last seen him, he had developed creases in his face, and shadows that went with his dark eyes, and (once he had put his wig on, and covered up the Tsar’s knuckle-prints) at least made him look serious and formidable.