Kim Philby was the most notorious British defector and Soviet mole in history‎.‎ Agent‎,‎ double agent‎,‎ traitor and enigma‎,‎ he betrayed every secret of Allied operations to the Russians in the early years of the Cold War‎.‎ Philby‎'‎s two closest friends in the intelligence world‎,‎ Nicholas Elliott of MI6 and James Jesus Angleton‎,‎ the CIA intelligence chief‎,‎ thought they knew Philby better than anyone‎,‎ and then discovered they had not known him at all‎.‎ This is a story of intimate duplicity‎;‎ of loyalty‎,‎ trust and treachery‎,‎ class and conscience‎;‎ of an ideological battle waged by men with cut‎-glass accents and well‎-made suits in the comfortable clubs and restaurants of London and Washington‎;‎ of male friendships forged‎,‎ and then systematically betrayed‎.‎ With access to newly released MI5 files and previously unseen family papers‎,‎ and with the cooperation of former officers of MI6 and the CIA‎,‎ this definitive biography unlocks what is perhaps the last great secret of the Cold War‎.‎