THERE ARE MOMENTS in even the simplest of operations when time stops. Gabriel had experienced more such moments than most professional intelligence officers. And he certainly experienced one at 3:36 a.m. in Paris while waiting for Zoe Reed, special investigative correspondent of the venerable Financial Journal of London, to respond to her lover, Martin Landesmann. He did not tell London about the potential problem. He did not tell his team. Instead, he stood in the window of the safe flat, binoculars to his eyes, Chiara at his side, and did what every experienced fieldhand does at a time like that. He held his breath.

The silence seemed to last an eternity. Later, when reviewing the recording, he would discover it was only three seconds. She began by complaining of a ferocious thirst, then playfully chastised Martin for hurling her clothing across the floor in his frenzy to undress her. And finally she suggested several things they might do now that they both happened to be awake at 3:36 in the morning.

Somewhere inside Gabriel was an ordinary man who wanted desperately not to eavesdrop. Professionalism would not allow it. And so he stood in the window of the safe flat with his wife at his side and listened while Zoe Reed made love one final time to a man whom Gabriel had convinced her to hate. And he listened, too, one hour and fifteen minutes later, as Zoe rose from Martin’s bed to retrieve the flash drive from Martin’s computer—a flash drive that had beamed the contents of Martin’s hard drive to a sturdy redbrick Victorian house in Highgate.

Gabriel’s partners in London would never hear the recordings from that night in Paris. They had no right. They would only know that Zoe Reed emerged from the apartment building on Île Saint-Louis at 8:15 a.m. and that she climbed in the back of a chauffeured Mercedes-Benz with the name REED in the window. The car ferried her directly to the Gare du Nord, where she was once again waylaid by several panhandlers and drug addicts as she hurried across the ticket hall toward her waiting train. A dread-locked Ukrainian with a mud-caked leather jacket proved to be the most persistent of her suitors. He finally backed down when confronted by a man with short dark hair and pockmarks on his face.