Television play about the infamous Cambridge spies. In the 1930s the KGB managed to pull off one of the biggest coups in the history of espionage when they placed several agents in top-ranking positions within the British Security Services. Kim Philby (Anthony Bate), Guy Burgess (Derek Jacobi) and Donald Maclean (Michael Culver) were all recruited whilst at Cambridge University. They succeeded in leaking a large amount of highly-classified information to the Russians before being discovered in the 1950s in a scandal which fairly rocked the British establishment. This film was made two years before fellow agent Anthony Blunt was officially unmasked.