Coincidentally, these were the very images occupying Isherwood’s thoughts when he spotted a solitary figure coming across the damp paving stones of Mason’s Yard, coat collar turned up against the late-autumn chill, eyes on the prowl. The man was in his early thirties, built like an armored fighting vehicle, and dressed in a dark suit. For an instant, Isherwood feared the man was some sort of heavy-fisted debt collector. But a few seconds later, he realized he had seen the man before. He worked in the security section of a certain embassy located in South Kensington—an embassy that, regrettably, was forced to employ many others like him.

A moment later, Isherwood heard the drowsy voice of his receptionist announcing there was a Mr. Radcliff to see him. It seemed Mr. Radcliff, a nom de plume if ever there was one, had a few minutes to kill between appointments and was wondering whether he might have a peek at the gallery’s inventory. Isherwood normally turned away such drop-ins. But on that morning, for all the obvious reasons, he made an exception.

He greeted the man circumspectly and led him to the privacy of the upper exhibition room. Just as Isherwood suspected, Mr. Radcliff’s tour was brief. He frowned at a Luini, clucked his tongue at a Bordone, and appeared puzzled by a luminous landscape by Claude. “I think I like it,” he said, handing Isherwood an envelope. “I’ll be in touch.” Then he lowered his voice to a whisper and added, “Make sure you follow the instructions carefully.”

Isherwood saw the young man to the door, then, in the privacy of his washroom, unsealed the envelope. Inside was a brief note. Isherwood read it once, then a second time, just to be sure. Leaning against the basin to steady himself, he was overcome by an immense wave of relief. Though Gabriel had not found the painting, his investigation had produced a critical piece of information. Isherwood’s original search of the painting’s provenance had failed to reveal it had been stolen during the Second World War. Therefore the rightful owner of the painting was not the mysterious unnamed client of David Cavendish but an elderly woman in Amsterdam. For Julian Isherwood, the discovery meant that the cloud of financial ruin had been lifted. Typically, matters involving looted art might be litigated for years. But Isherwood knew from experience that no decent court in the world would ever force him to compensate a man for a painting that was not rightly his. The Rembrandt was still missing and might never be found. But, simply put, Isherwood was now off the hook.