But no high-profile case is ever entirely free of controversy-and the old hands warned they had never met a defector, especially a Russian defector, who didn’t lose a wheel from time to time. Grigori’s came off the day the British prime minister announced a major terrorist plot had been disrupted. It seemed al-Qaeda had planned to simultaneously shoot down several jet-liners using Russian-made antiaircraft missiles-missiles they had acquired from Grigori’s former patron, Ivan Kharkov. Within twenty-four hours, Grigori was seated before the cameras of the BBC, claiming he had played a major role in the affair. In the days and weeks that followed, he would remain a fixture on television, in Britain and elsewhere. His celebrity status now cemented, he began to move in Russian émigré circles and cavort with Russian dissidents of every stripe. Seduced by the sudden attention, he used his newfound fame as a platform to make wild accusations against his old service and against the Russian president, whom he characterized as a Hitler in the making. When the Kremlin responded with uncomfortable noises about Russians plotting a coup on British soil, Grigori’s minder suggested he tone things down. So, too, did his editor, who wanted to save something for the book.

Grudgingly, the defector lowered his profile, but only by a little. Rather than pick fights with the Kremlin, he focused his considerable energy on his forthcoming book and on his chess. That winter he entered the annual club tournament and moved effortlessly through his bracket-like a Russian tank through the streets of Prague, grumbled one of his victims. In the semifinals, he defeated the defending champion without breaking a sweat. Victory in the finals appeared inevitable.

On the afternoon of the championship, he lunched in Soho with a reporter from Vanity Fair magazine. Returning to Maida Vale, he purchased a house plant from the Clifton Nurseries and collected a parcel of shirts from his laundry in Elgin Avenue. After a brief nap, a prematch ritual, he showered and dressed for battle, departing his mews cottage a few minutes before six.

All of which explains why Grigori Bulganov, defector and dissident, was walking along London’s Harrow Road at 6:12 p.m., on the second Tuesday of January. For reasons that would be made clear later, he was moving at a faster pace than normal. As for chess, it was by then the last thing on his mind.

THE MATCH was scheduled for half past six at the club’s usual venue, the Lower Vestry House of St. George’s Church in Bloomsbury. Simon Finch, Grigori’s opponent, arrived at a quarter past. Shaking the rainwater from his oilskin coat, he squinted at a trio of notices tacked to the bulletin board in the foyer. One forbade smoking, another warned against blocking the corridor in case of fire, and a third, hung by Finch himself, pleaded with all those who used the premises to recycle their rubbish. In the words of George Mercer, club captain and six-time club champion, Finch was “a Camden Town crusty,” bedecked with all the required political convictions of his tribe. Free Palestine. Free Tibet. Stop the Genocide in Darfur. End the War in Iraq. Recycle or Die. The only cause Finch didn’t seem to believe in was work. He described himself as “a social activist and freelance journalist,” which Clive Atherton, the club’s reactionary treasurer, accurately translated as “layabout and sponge.” But even Clive was the first to admit that Finch possessed the loveliest of games: flowing, artistic, instinctive, and ruthless as a snake. “Simon’s costly education wasn’t a total waste,” Clive was fond of saying. “Just misapplied.”

His surname was a misnomer, for Finch was long and languid, with limp brown hair that hung nearly to his shoulders and wire-rimmed spectacles that magnified the resolute gaze of a revolutionary. To the bulletin board he added a fourth item now-a fawning letter from the Regent Hall Church thanking the club for hosting the first annual Salvation Army chess tournament for the homeless-then he drifted down the narrow corridor to the makeshift cloakroom, where he hung his coat on the rollaway rack. In the kitchenette, he deposited twenty pence in a giant piggy bank and drew a cup of tepid coffee from a silver canister marked CHESS CLUB. Young Tom Blakemore-a misnomer as well, for Young Tom was eighty-five in the shade-bumped into him as he was coming out. Finch seemed not to notice. Interviewed later by a man from MI5, Young Tom said he had taken no offense. After all, not a single member of the club gave Finch even an outside chance of winning the cup. “He looked like a man being led to the gallows,” said Young Tom. “The only thing missing was the black hood.”

Finch entered the storage cabinet and from a row of sagging shelves collected a board, a box of pieces, an analog tournament clock, and a score sheet. Coffee in one hand, match supplies carefully balanced in the other, he entered the vestry’s main room. It had walls the color of mustard and four grimy windows: three peering onto the pavements of Little Russell Street and a fourth squinting into the courtyard. On one wall, below a small crucifix, was the tournament bracket. One match remained to be played: S. FINCH VS. G. BULGANOV.

Finch turned and surveyed the room. Six trestle tables had been erected for the evening’s play, one reserved for the championship, the rest for ordinary matches-“friendlies,” in the parlance of the club. A devout atheist, Finch chose the spot farthest from the crucifix and methodically prepared for the contest. He checked the tip of his pencil and wrote the date and the board number on the score sheet. He closed his eyes and saw the match as he hoped it would unfold. Then, fifteen minutes after taking his seat, he looked up at the clock: 6:42. Grigori was late. Odd, thought Finch. The Russian was never late.

Finch began moving pieces in his mind-saw a king lying on its side in resignation, saw Grigori hanging his head in shame-and he watched the relentless march of the clock.

6:45… 6:51… 6:58…

Where are you, Grigori? he thought. Where the hell are you?

ULTIMATELY, Finch’s role would be minor and, in the opinion of all involved, mercifully brief. There were some who wanted to have a closer look at a few of his more deplorable political associations. There were others who refused to touch him, having rightly judged Finch to be a man who would relish nothing more than a good public spat with the security services. In the end, however, it would be determined his only crime was one of sports manship. Because at precisely 7:05 p.m.-the time recorded in his own hand on the official score sheet-he exercised his right to claim victory by forfeiture, thus becoming the first player in club history to win the championship without moving a single piece. It was a dubious honor, one the chess players of British intelligence would never quite forgive.

Ari Shamron, the legendary Israeli spymaster, would later say that never before had so much blood flowed from so humble a beginning. But even Shamron, who was guilty of the occasional rhetorical flourish, knew the remark was far from accurate. For the events that followed had their true origins not in Grigori’s disappearance but in a feud of Shamron’s own making. Grigori, he would confide to his most devoted acolytes, was but a shot over our complacent bow. A signal fire on a distant watchtower. And the bait used to lure Gabriel into the open.

By the following evening, the score sheet was in the possession of MI5, along with the entire tournament logbook. The Americans were informed of Grigori’s disappearance twenty-four hours later, but, for reasons never fully explained, British intelligence waited four long days before getting around to telling the Israelis. Shamron, who had fought in Israel ’s war of independence and loathed the British to this day, found the delay predictable. Within minutes he was on the phone to Uzi Navot giving him marching orders. Navot reluctantly obeyed. It was what Navot did best.