 The screenplay, which concerns a pilot who tries to rescue a girl from Communist-controlled China, was based on a story by Gordon Wellesley and made by Hammer Films and Swallow Productions.Don Benton (Richard Basehart), a former World War II combat pilot, now running a travel agency in Hong Kong, refuses to take political sides and flatly rejects an offer to do espionage work for the United States.When Mao Tai Tai (Athene Seyler), an old Chinese woman who more or less adopted Benton during the war years, asks him to try to find her missing grandson.