The drive from Heathrow into London took place under a sky the color of gunmetal, and the city seemed to rise out of the rain as if it had been waiting for me. The man who met me introduced himself only after the car doors sealed us into that upholstered hush wealthy governments seem to favor. His name was Philip Ashcroft, and he spoke with the economy of someone used to escorting dangerous information rather than people. I asked him, after we’d crossed into the city proper, why the Queen would want to see an American lieutenant whose own family had just treated her like an inconvenient footnote. He considered the question before answering. “Your grandfather,” he said, “was regarded in certain circles here as a man of uncommon discretion.” That was such a British sentence that I almost laughed, but I understood immediately that it meant more than politeness. It meant classified. It meant history I had not been trusted with.