Mystery's End: A Fifth Man Is Unmasked At Last

Who was the "Fifth Man," the British spy for the Soviet Union who worked with Kim Philby, Guy Burgess, Donald Maclean and Anthony Blunt during and after World War II? For four decades, espionage fans have had no shortage of suspects. Last year Soviet defector Oleg Gordievsky published a book, KGB: The Inside Story, in which he fingered a scholarly Cambridge graduate named John Cairncross as the mystery man. Cairncross admitted long ago that he spied for the Soviets, but at the level of a footsoldier and in an effort to aid a wartime ally. The British government believed him and...

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