L'inspecteur connaît la musique

In a small Breton town, a 10-year-old girl is found murdered. René, her art teacher, a professional painter, is the last person to have seen her alive. The inspector in charge of the investigation immediately questions him. In this small provincial town where people all know each other and regularly meet at the Bar des Amis, René is increasingly unsettled by the other inhabitants' suspicions and by the inspector's investigation. Children stop coming to him for lessons. His wife, Viviane, a district nurse, protects him and supports him with her love. However, a self-centred media-star writer adds to René's confusion...

In 1930s Paris, Madeleine, a pretty, young, penniless, and talentless actress, is accused of murdering a famous producer. Helped by her best friend, Pauline, a young, unemployed lawyer, she is acquitted on the grounds of self-defense. A new life of fame and success begins, until the truth comes out.

Industrialist Pierre Verdier kills his mistress Jeanne Ancelin by throwing her off a train. Her husband, Ancelin, decides to take revenge on his wife's murderer, who has been acquitted by justice.

The film story depicts Emile Buisson, following the death of his wife and child, escaping from a psychiatric institution in 1947 and returning to Paris. Buisson, who three years later would become France's public enemy number one, begins a murderous rampage through the French capital.

A newspaper publisher, wanting to prove a point about the insufficiency of circumstantial evidence, talks his possible son-in-law Tom into a hoax in an attempt to expose ineptitude of the city's hard-line district attorney. The plan is to have Tom plant clues leading to his arrest for killing a female nightclub dancer. Once Tom is found guilty, he is to reveal the setup and humiliate the DA.