Three teenage Parisian punks are duped by a crime syndicate into committing a bank robbery that will distract the authorities while the seasoned crooks hijack an armored truck across town. Disaster ensues and two of the youngsters are killed, including the estranged daughter of widowed auto repair shop owner Jeanne Dufour. A grieving Jeanne ignores her own fear, as well as the law, and sets out to eliminate all of those responsible for her daughter’s death.

A group of outlaws takes a man's wife and child hostage. He must walk a fine line between working with the police to rescue his family and not angering the kidnappers to the point where they might hurt or kill them.

A series of murders is committed in Nice on the French riviera. The commissaire Carella is in charge and tries to find a missing link between all these murders.

An Italian painter, Antonio Berti, pays a visit to Reims to his friend Robert Maurisson, a banker with political views on the town hall, who hides, under an affable air and an irreproachable dignity, a libertine and cynical temperament. Charged by the notable with the restoration of paintings exhibited in the cathedral, the artist calls on Cathy, a young girl from the choir, to serve as his model. The young girl will be found dead a few hours after their interview, near one of Robert's properties.

François Holin, apodado Ho, es un antiguo piloto de carreras, conductor de una banda de malhechores que no lo respetan demasiado y lo consideran un inútil. Un día se le presenta la ocasión de dirigir una operación, pero los otros se niegan. Ho tendrá que hacerlo solo.

Marceau Léonetti, a competent and energetic officer stops by chance the son of an influential lawyer driving under the influence of alcohol. A few months later, the lawyer falsely accuses Léonetti as being violent and incompetent. As a result Marceau is transferred to a small police station, where he meets young and beautiful Jeanne. Soon they are faced with a tough investigation.