A Civil Intelligence agent investigating the kidnap and psychedelic brainwashing of Britain's most renowned scientists unpicks a complex chain of connections and high-level intrigue, while detecting evidence of double-dealing and counter-espionage. Spy thriller based on Len Deighton's novel, starring Michael Caine, Sue Lloyd, Gordon Jackson and Nigel Green.

Sly and dry intelligence agent Harry Palmer is tasked with investigating British Intelligence security, and is soon enmeshed in a world of double-dealing, kidnap and murder when he finds a traitor operating at the heart of the secret service.