There was something else Julian Isherwood kept secret from his competitors in the London art world—and from nearly everyone else, for that matter. Over the years he had done the occasional favor for a certain gentleman from Tel Aviv named Shamron. Isherwood, in the Hebrew-based jargon of Shamron’s irregular outfit, was a sayan, an unpaid volunteer helper, though most of his encounters with Shamron had been closer to blackmail than voluntarism.

Just then Isherwood spotted a flash of leather and denim amid the fluttering mackintoshes of New Bond Street. The figure vanished for a moment, then reappeared suddenly, as though he had stepped through a curtain onto a lighted stage. Isherwood, as always, was taken aback by his unimpressive physical stature—five-eight, perhaps, a hundred and fifty pounds fully clothed. His hands were thrust into the pockets of a car-length black-leather jacket, his shoulders were slumped slightly forward. His walk was smooth and seemingly without effort, and there was a slight outward bend to his legs that Isherwood always associated with men who could run very fast or were good at football. He wore a pair of neat suede brogues with rubber soles and, despite the steady rain, carried no umbrella. The face came into focus—long, high at the forehead, narrow at the chin. The nose looked as though it had been carved from wood, the cheekbones were wide and prominent, and there was a hint of the Russian steppes in the green, restless eyes. The black hair was cropped short and very gray at the temples. It was a face of many possible national origins, and Gabriel had the linguistic gifts to put it to good use. Isherwood never quite knew who to expect when Gabriel walked through the door. He was no one, he lived nowhere. He was the eternal wandering Jew.

Suddenly he was standing at Isherwood’s side. He offered no greeting, and his hands remained jammed in his coat pockets. The manners Gabriel had acquired working for Shamron in the secret world had left him ill-equipped to function in the overt one. Only when he was playing a role did he appear animated. In those rare flashes when an outsider glimpsed the real Gabriel—such as now, thought Isherwood—the man they saw was silent and sullen and clinically shy. Gabriel made people supremely uncomfortable. It was one of his many gifts.

They walked across the lobby toward the registrar’s desk. “Who are we today?” Isherwood asked sotto voce, but Gabriel just leaned over and scrawled something illegible in the logbook. Isherwood had forgotten that he was left-handed. Signed his name with his left hand, held a paintbrush with his right, handled his knife and fork with either. And his Beretta? Thankfully, Isherwood did not know the answer to that.