"Triplex" reveals more clearly than ever before the precise nature and extent of the damage done to the much-vaunted British intelligence establishment during World War II by the notorious 'Cambridge Five' spy ring - Kim Philby, Donald Maclean, Guy Burgess, Anthony Blunt, and John Cairncross. The code word "Triplex" refers to an exceptionally sensitive intelligence source, one of the most closely guarded secrets of the war, which appears nowhere in any of the British government's official histories. "Triplex" was material extracted illicitly from the diplomatic pouches of neutral missions in wartime London. MI5, the British Security Service, entrusted the job of overseeing the highly secret assignment to Anthony Blunt, who was already working for the NKVD, Stalin's intelligence service. The rest is history, documented here for the first time in rich detail.

Nigel West is a renowned British historian of military intelligence and has written more than 25 related books. Oleg Tsarev is a retired KGB officer who has co-written a number of books on wartime espionage and intelligence.

""TRIPLEX" is the first complete report on the Cambridge Five that gives the reader the opportunity to judge the extent of the damage done to the British service concerned. It will be greeted with enthusiasm by specialists in intelligence history."--David Murphy, former CIA Berlin chief, former chief of Soviet operations at CIA headquarters in the United States, and author of "What Stalin Knew"--David Murphy