Lavon switched on a small Maglite and led the way into the sitting room. The furnishings were of flea market quality, the floor was cracked linoleum, and the walls were bare except for a single travel poster depicting the Dome of the Rock in Jerusalem. Gabriel walked over to the long trestle table that served as Samir’s desk. It was empty except for a single yellow legal pad and a cheap desk lamp.

He switched on the lamp and examined the pad. Two-thirds of it had been used and the top page was blank. He moved his fingers over the surface and felt impressions. An amateur’s mistake. He handed the pad to Lavon, then took hold of the flashlight and shone it at an angle over the surface of the table. It was covered in a fine layer of dust except for a precise square in the center—the spot, Gabriel reckoned, where Samir’s computer had been before his flight from Amsterdam.

“Search the furniture cushions,” Gabriel said. “I’ll have a look around the rest of the flat.”

He went through a doorway into the kitchen. The debris of Samir’s final gathering with his acolytes from the al-Hijrah Mosque lay strewn across the linoleum countertops: empty takeaway containers, greasy paper plates, discarded plastic utensils, squashed teabags. Gabriel opened the refrigerator, a favorite terrorist storage space for explosives, and saw that it was empty. The same was true of all the cabinets. He looked in the cupboard beneath the sink and found nothing but an unopened container of kitchen cleaner. Samir, Islamic theoretician and spokesman for the jihadi cause, was a typical bachelor slob.

Gabriel paused for a moment in the sitting room to check on Lavon’s progress, then headed down a short hallway toward the back of the apartment. Samir’s bathroom was as appalling as the kitchen. Gabriel gave it a rapid search, then entered the bedroom. A stripped mattress lay slightly askew on the metal frame and the three drawers of the dresser were all partially open. Samir, it seemed, had packed in a hurry.

Gabriel removed the top drawer and dumped the remaining contents onto the bed. Threadbare underwear, mismatched socks, a book of matches from a discotheque in London’s Leicester Square, an envelope from a photo-processing shop around the corner. Gabriel slipped the matches into his pocket, then opened the envelope and leafed through the prints. He saw Samir in Trafalgar Square and Samir with a member of the Queen’s Life Guard outside Buckingham Palace; Samir riding the Millennium Wheel and Samir outside the Houses of Parliament. The last photograph, Samir posing with four friends in front of the American embassy in Grosvenor Square, caused Gabriel’s heart to skip a beat.