Guy Burgess was arguably the most influential spy of the Cambridge Five, a covert group of Englishmen who traded Western secrets to the Soviets before and during the Cold War. And yet, 70 years after the height of his espionage, Burgess' name and legacy still remain widely unknown. Today on Unknown History, Giles Milton hosts author and historian Andrew Lownie, who spent 30 years uncovering Burgess' enigmatic life in Stalin's Englishman: The Lives of Guy Burgess. Read the full transcript here: http://bit.ly/2kIrqfo