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