Recruited by the Russians during their days at Cambridge, three young Englishmen rise to become high-ranked MI5 agents until their exposure in 1949.
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Character: Kim Philby
Character: Guy Burgess
Character: Donald Maclean
Character: Aileen Philby
Character: Melinda Maclean
Character: Sir Stewart Menzies
Character: Farquesson
Character: Philby's Control
Character: Herbert Morrison
Character: Graves
Character: Pattterson
Character: Reed
Character: Peterson
Character: Skardon
Character: Helenus Milmo
Character: Marcus Lipton
Character: Reporter
Character: Major Sansom
Character: Volkov