Standing at the foot of the spectacular light-strewn fir tree was Saint Martin Landesmann in all his glory. Martin of the careful handshake. Martin of the whispered confidence. Martin of the solicitous nod. Monique and the children seemed like mere accessories, like Martin’s understated Patek Philippe wristwatch and the two Zentrum bodyguards standing with feigned detachment at his back. Monique was taller than Martin by an inch. Her long dark hair was swept directly back from her forehead, and she wore a sleeveless gown that flattered her slender arms. Martin seemed oblivious to her beauty. He had eyes only for his invited guests. And, briefly, for the famous British reporter who was now standing five feet away at the side of a Russian millionaire named Mikhail Danilov. Mr. Danilov handed the reception card to the attendant at the front of the line. Then he lowered his eyes to the marble floor and waited for their names to be called.

THERE EXISTS a snapshot of the encounter that followed. Unposed, it was captured by one of the commercial photographers hired for the event and was later stolen from his computer as part of the multinational inquiry conducted at the conclusion of the affair. In retrospect, it was a remarkably accurate predictor of the events that followed. Martin’s expression was curiously dour for such a joyous occasion, and by a trick of the camera angle his gaze appeared fixed on both Mikhail and Zoe at the same time. Monique was looking at neither. In fact, Monique’s elegant head was adroitly turned in the opposite direction.

The photograph did not reflect the brevity of the encounter, though the audio feed did. Just fifteen seconds in length, it was obtained by not one but two sources—the mobile phone in Zoe Reed’s clutch and the Nokia N900 that, in violation of Monique’s expressed wishes, was tucked into the breast pocket of Martin’s formal jacket. Gabriel listened to the recording three times, then dashed off a message to London as Zoe and Mikhail waded into the party. The orchestra was playing “See, the Conqu’ring Hero Come” by Handel. Even Zoe had to laugh.