Rod Taylor and Christopher Plummer star in this 1960s action thriller adapted from Jon Cleary's novel 'The High Commissioner'. Australian police sergeant Scobie Malone (Taylor) is sent to London to arrest High Commissioner Sir James Quentin (Plummer), who is currently engaged in sensitive peace talks, on the suspicion of murdering his first wife 25 years previously. Malone allows Quentin a few days to finish his work before taking him back to Australia and during this time stays with the suspect and his second wife Sheila (Lilli Palmer) in their home. Complications arise, however, when Malone finds himself having to prevent Quentin's assassination at the hands of a ruthless group of spies.