Harley Street physicians, Keller had made it clear at an early age that he had no intention of following in his parents’ footsteps. Obsessed with history, especially military history, he wanted to become a soldier. His parents forbade him to enter the military, and for a time he acceded to their wishes. He enrolled at Cambridge and began reading history and Oriental languages. He was a brilliant student, but in his second year he grew restless and one night vanished without a trace. A few days later he surfaced at his father’s Kensington home, hair cut to the scalp, dressed in an olive-drab uniform. He had enlisted in the British army.
After completing his basic training, Keller joined an infantry unit, but his intellect, physical prowess, and lone-wolf attitude quickly captured the attention of the elite Special Air Service. Within days of his arrival at the Regiment’s headquarters at Hereford, it became clear Keller had found his true calling. His scores in the “killing house,” an infamous facility where recruits practice close-quarters combat and hostage rescue, were the highest ever recorded, while the instructors in the unarmed combat course wrote that they had never seen a man who possessed such an instinctual knack for the taking of human life. His training culminated with a forty-mile march across the windswept moorland known as the Brecon Beacons, an endurance test that had left men dead. Laden with a fifty-five-pound rucksack and a ten-pound assault rifle, Keller broke the course record by thirty minutes, a mark that stands to this day.
Initially, he was assigned to a Sabre squadron specializing in mobile desert warfare, but his career soon took another turn when a man from military intelligence came calling. The man was looking for a unique brand of soldier capable of performing close observation and other special tasks in Northern Ireland. He said he was impressed by Keller’s linguistic skills and his ability to improvise and think on his feet. Was Keller interested? That same night Keller packed his kit and moved from Hereford to a secret base in the Scottish Highlands.
During his training, Keller displayed yet another remarkable gift. For years the British security and intelligence forces had struggled with the myriad of accents in Northern Ireland. In Ulster the opposing communities could identify each other by the sound of a voice, and the way a man uttered a few simple phrases could mean the difference between life and an appalling death. Keller developed the ability to mimic the intonations perfectly. He could even shift accents at a moment’s notice—a Catholic from Armagh one minute, a Protestant from Belfast’s Shankill Road the next, then a Catholic from the Ballymurphy housing estates. He operated in Belfast for more than a year, tracking known members of the IRA, picking up bits of useful gossip from the surrounding community. The nature of his work meant that he would sometimes go several weeks without contacting his control officers.
His assignment in Northern Ireland came to an abrupt end late one night when he was kidnapped in West Belfast and driven to a remote farmhouse in County Armagh. There he was accused of being a British spy. Keller knew the situation was hopeless, so he decided to fight his way out. By the time he left the farmhouse, four hardened terrorists from the Provisional Irish Republican Army were dead. Two had been virtually cut to pieces.
Keller returned to Hereford for what he thought would be a long rest and a stint as an instructor. But his stay ended in August 1990, when Saddam Hussein invaded Kuwait. Keller quickly rejoined his old Sabre unit and by January 1991 was in the western desert of Iraq, searching out the Scud missile launchers that were raining terror on Tel Aviv. On the night of January 28, Keller and his team located a launcher about one hundred miles northwest of Baghdad and radioed the coordinates to their commanders in Saudi Arabia. Ninety