The 10th film in the travel series. The original work and screenplay is by Kazuo Funahashi, the director is Shoji Segawa, and the cinematography is by Keiji Maruyama.
After a peaceful sailboat ride, four young people, including rich kid Bill, Joe, Fred and Jane, knock on the door of a secluded villa after their dune buggy runs out of gas.
Doc Saxon and his gang rob the Crown City bank but are double-crossed by Carrasco, a Mexican bandit, who steals the gold and leaves Doc and Donovan with nothing.
A frustrated Frankfurt innkeeper is recruited as an agent for the "Gehlen Organization" and after a short training period, during which he is familiarized with sophisticated espionage methods, he takes his first steps as a spy.
Paul, a former womanizer, marries the head of the medical department's "unattractive" daughter Christine because he thinks attractive women can't be trusted and make poor wives.