A run-down hotel's staff sabotages the road to force people to book rooms.

An aristocratic French family has become so financially ruined that the matriarchal Marquise has had to turn the family's chateau into a hotel. There are few guests, however, until the Marquise's granddaughter Amelie seduces her boyfriend Charlie, the local garage mechanic, into sabotaging the automobiles that stop for gas and sending the stranded drivers up to the chateau. Soon business is booming, and the ladies of the house, including Amelie's virginal sister Jeanne and their mother, Diane, busy themselves making the guests content. Then Cesar Maricorne arrives, and despite his assertion that he is a diplomat, it is apparent that he is something else, particularly since his male "secretaries" carry guns. Cesar's amorous antics and his behavior have a bad influence on the other visitors at the chateau, and it is decided that he must leave. He and his companions run into a police roadblock, and in the ensuing confusion, the two secretaries and their car sink in a lake, but Cesar returns to the chateau with his attaché case. Thinking himself alone, he telephones for a rescue plane and is overheard by Amelie, who deduces that Cesar is the man who recently robbed a bank of over a million francs. The family agrees that although Cesar must go, his money must remain. They attempt to dispose of him by various means, but the indestructible Cesar survives. When he sets out signal lanterns for the rescue plane, Jeanne, who has fallen in love with him, moves the lanterns and diverts the plane into a river. Cesar gladly returns to the chateau with Jeanne, and within a few months, the chateau has been converted into an elegant resort, and Cesar has given up his life of crime.