Patricia, the daughter of wealthy businessman Léonard Monestier, is tired of the persistent advances of Antoine, a rich older admirer. To escape his attention, she persuades a young chauffeur to pretend to be her husband. Meanwhile, her father discovers that his wife has been tricked into buying a worthless oil concession and devises a scheme to sell it to Antoine. As the family's conflicting plans collide, misunderstandings and comic complications turn the Monestier household upside down.