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
Aileen Philby
Melinda Maclean
Sir Stewart Menzies
Farquesson
Philby's Control
Herbert Morrison
Graves
Pattterson
Reed
Peterson
Skardon
Helenus Milmo
Marcus Lipton
Reporter
Major Sansom
Volkov