The Executioner is a 1970 British Cold War neo noir spy thriller film directed by Sam Wanamaker in Panavision and starring George Peppard as secret agent John Shay who suspects his colleague Adam Booth, played by Keith Michell, is a double agent.

[3][4] John Shay (George Peppard), a British MI5 agent, had grown up in the United States,[5] and was nearly killed while on assignment abroad.

[6] The action takes place in London, Athens, Istanbul and Corfu, where Shay goes in his investigation trying to gather evidence that Booth is a double agent.

Upon arrival in Athens, Shay assumes Booth's identity and subsequently goes to Corfu, where he is captured along with Sarah by Soviet agents who want Crawford in return for the freedom of their captives.

Colonel Scott (Shay's superior) reveals that Sarah's husband was indeed a double agent who was used by MI5 to supply the Soviets with false information.