The title character is American doctor Ben McKenna. On vacation in Morocco with his wife, Jo, and his eight-year-old son, Hank, he inadvertently witnesses a murder in a market and becomes privy to a plot of political assassination. This was masterminded by the Draytons, an English couple they have met in a restaurant, and is due to take place in London in a few days. In order to prevent McKenna from going to the police, the couple kidnap Hank. Ben is warned not to tell the police what he knows. Hank's life depends on his silence.—filmfactsman