Hector Dumontier has had enough of his wife Noémie : she is always immersed in those detective stories he disapproves of. To teach her a lesson, Dumontier decides to simulate the burglary of their house, with the help of an alleged jewel thief masked by a hood. He creates many false leads and everybody in the house gets suspected, from Ernestine, the maid, to Cabassol, the chauffeur, to Rosine, the Dumontiers'daughter.