Hélène and Aldo Giovanni are a circus trapeze double act and a couple. Aldo is temporarily replaced by former-partner Alexandre when the former is injured. The two get into a fight and the following day Alexandre is discovered dead. Hélène suspects her husband is responsible for the murder.

Paul Braconnier and his wife Blandine only have one thing in mind: to find a way to kill each other without risk. After listening to a radio show, Paul decides to go to Paris to meet a famous lawyer in the acquittal of the murderers. He tells the lawyer that he killed his wife. The lawyer asks Paul to reconstruct the circumstances of the drama. Without knowing it, he explains, in spite of himself, the way for Paul to murder his wife by putting the odds on his side to avoid death penalty or even be released...

The ladykiller friend of a busy diplomatic attaché follows a masked blonde home after an elaborate ball without knowing she is that man's wife.

Christianne Delannoy is the daughter of Mr. Brown, who subsidizes a nursery in memory of his affair with Mrs. Delannoy. She loves Doctor Moreau, but her mother forces her to marry a rich young man.

There are collectors and collectors. As far as he is concerned, Monsieur Coquelet has brought together a collection of historical... garters! So imagine his reaction when he realizes his most invaluable piece has been stolen... Municipal police and gendarmerie are alerted. The culprit is caught at long last but he is not... among the usual suspects!

For sentimental reasons, Monsieur Imberger, a fifty-year-old, disappears. Everyone thinks he was murdered but repeatedly he reappears. Inspector Barfin takes care of this mystery...

In 1912, a Russian officer is wrongly accused of having stolen important papers. His only alibi being to have spent the night with the wife of a colonel, he allows himself to be condemned so as not to compromise the latter. He manages to escape and hides in the guise of a poor boatman. One day, the truth comes out, the colonel commits suicide and the lovers are finally reunited.

Tino is a painter and occasionally a singer. When he has an opportunity to replace an absent singer, he becomes a sucess as a masqued singer, "Le chanteur masqué". Lisa is a typist who becomes a successful singer, also as a masqued singer, "La chanteuse masquée". Tino the painter falls in love for Lisa the typist, not knowing about her "masqued" activities. On the stage they are rivals.