A friendly average Frenchman pretends to be a famous commissioner on vacation. He arrives in a castle converted into a boarding house where, after dinner, guests are invited to participate in a "murder-party". The so-called victim of this little game is really murdered and the fake commissioner must lead the investigation.

A young man who applies for the position of general manager in a fashion house has not reached the desired age. Thanks to a skilful make-up, he gives himself the required appearance and under the name of Monsieur Bégonia, now presides over the destinies of the house.

For still being a bachelor at an "advanced" age, César is the laughing stock of the neighborhood. Determined to change things, César goes in search of hearts to take.

Popolka takes advantage of the absence of his shrew of a wife to indulge in the delights of single life. His manager showers him with favors because he is in love with a young woman whom he believes to be Popolka's wife. When Madame Popolka returns, the situation becomes confused...