The Executioner

John Shay, a British MI5 agent, had grown up in the United States, and who was nearly killed while on assignment abroad. Convinced that he was framed, he returns to London to uncover the mole responsible for the set-up. John Shay suspects that his colleague Adam Booth is a Russian spy. 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. When Shay's superiors are not convinced, and even after a special hearing clears Booth of any wrongdoing, he takes matters into his own hands and executes Booth.