This chapter presents an introduction to “Triplex,” which was one of the most closely guarded secrets of the World War II. No reference to it has ever been published, and the official multivolume history of British Intelligence in World War II contains absolutely no mention of this source, which is still highly classified in Britain. The chapter reveals that the Soviet spies recruited from Cambridge University were known in Moscow as the “Ring of Five” and consisted of Kim Philby, Donald Maclean, Guy Burgess, Anthony Blunt, and John Cairncross. What made the network so remarkable was that they all knew one another. The only outsider was John Cairncross, a formidable intellect but a cantankerous, socially insecure Scot who, despite his undoubted talents, made himself unpopular in successive Whitehall posts, including the Foreign Office, the Treasury, the Secret Intelligence Service SIS, and the Government Communications Headquarters.
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