Successful author Antoine falls victim to a blackmailer, Jo. He decides to get rid of him according to his perfect crime scenario, gives up and finally lets him die accidentally. Antoine buries him under a bandstand being built in his garden. But Inspector Ducroc has his suspicions.
Georges Despeu, an employee without stature or fortune, is about to receive his daughter Barbara whom he has not seen since her early childhood. She returns from the United States to meet her father. With the complicity of his brother, guardian of the Monjambier's property, Georges decides to settle in the luxurious villa and to play the rich owner not to disappoint his daughter. Things get complicated when, on the one hand, two gangsters on the run take refuge in the villa, and on the other hand, Mr. Monjambier decides to try his luck with his secretary and also arrives at the villa to spend a fraudulent weekend.
