A scientist who have discovered how to turn salt water into petrol dies before he has revealed his formula. By mistake it's assumed that his assistant knows it although he does not.

A Corsican fisherman is the victim of a vendetta, when he was wrong to date the niece of a businessman proposing to create a seaside resort, much to the anger of the islanders.

Without seeming to touch it, journalist Trupeau is interested in the doings of Mireille, a jewelry store saleswoman. A certain Jojo is hanging around the young girl, and not for the right reasons, but to pull off a "heist". Although one of his men betrays him and has to be shot, Jojo succeeds. The police investigate, question and pursue Mireille. Exasperated and disillusioned, the pretty salesgirl shoots Jojo. Fortunately, the journalist is there to prove that she's as white as an ermine. And the ch timents rain down on the culprits.

Max, Michel and Nicole: three high school students, three victims. The first is a victim of himself, the other two are victims of having known him. As some people collect stamps, Max collects newspaper articles, recounting the exploits of certain "racketters" who sign their misdeeds with an ace of spades.

"Poisoner" - After her fiancé is arrested Claire finds herself alone and forced to find work. She is hired by a country squire, Etienne de Montenoy, as the tutor of his goddaughter. It does not take long before Montenoy falls for her but a little longer before the young woman, reluctant at first, understands Etienne loves her truly and then requites his love. Etienne lives so happily with her that he decides to make her his heir. Shortly after, he is murdered by poison...