In 1963, former British secret service agent Kim Philby fled Beirut for Moscow just steps away from a CIA hit team, and closed the door on the Soviet Union's most successful penetration of Western intelligence. Philby's exploits as a Soviet mole - he served as MI6's chief liason with the CIA in Washington, and was the lynchpin of the notorious Cambridge spy ring - have inspired countless spy novelists, from John le Carre to Len Deighton. Russian journalist Genrikh Borovik, drawing on a trove of new information culled from the KGB's Philby files and from Philby himself, at last answers the lingering questions about the Soviet master spy. From his recruitment at Cambridge to his involvement in a plot to assassinate Franco, from the KGB's doubts about his loyalty to the details of espionage tradecraft, here is the last word on Philby.