Released from prison after two years, Michel Gérard sets out to find his wife Alice. Alice, luxuriously maintained by her lover, Jacques Rupert, editor-in-chief of a major newspaper, rejects him. Shortly afterwards, Rupert discovers Alice dead, murdered. Fearing charges, he asks one of his reporters, Barney Morgan, to direct suspicion to Michel. But Michel's lawyer shows Barney that the husband is innocent.

The Raffin Commissioner investigates the murder of an industrialist and it soon becomes apparent that the activities of the relatives of the deceased all revolve around the Folies-Bergere.

Michel Piccoli plays a police inspector whose best friend is murdered on the orders of gang boss Charles Vanel. The inspector knows full well that Vanel is too crafty and well-connected to ever stand trial for his crime, so he carefully lays a subtle trap for his adversary. Unfortunately, both Piccoli and Vanel are thwarted by a pair of scheming females.

Géo Paquet, aka The Gorilla, breaks from jail. Now an escaped convict, the elite agent must infiltrate a dangerous gang working for a foreign embassy as their leader, a spy enjoying diplomatic immunity, can't be arrested by regular police.