The brother of Jeanne Masson, a young nightclub singer, has been murdered by Brasier, a criminal who pretends to be a respectable man. Jeanne has resolved to avenge her brother but she just cannot take action herself. The way she finds is to ask police detective Pierre Leblanc to help her do it. Pierre gives his agreement and starts following the trail. He soon finds out that Brasier belongs to a gang whose boss, Cortedani, has ordered the murder.

Bavaria, 1433. Reason of state rules that Prince Albert is to marry Princess Bertha of Wurtemberg. But the fine-looking young man is loath to become the husband of a woman with pimples,flat feet and no breast. Nevertheless, he has to obey his authoritarian father, Duke Ernest, and accompanied by faithful Count Törring, he mounts his steed and sets out for Würtemberg. Stopping in Augsburg, he falls in love with the daughter of a local barber-surgeon, pure and beautiful Agnès Bernauer. The couple is soon secretly married and both take refuge at the castle of Margravine Josepha, Albert's aunt, waiting for Ernest's consent. Unluckily Albert's father will not accept his son's union with a commoner and Albert, supported by Josepha and an army of common people, declares war on the Duke. They seem about to be victorious when Brother Enrique, a monk formerly in the Holy Inquisition, finds a way to reverse the situation: accusing Agnès of witchcraft...

Bertal, a despotic and hated theater director, is assassinated before a performance of Macbeth in which he was to play with Aurélia Nobli, his companion and Ludovic Arn, her lover. The police arrive on the scene and the investigation begins. Suspicion first falls on Sigurd, an old actor who had threatened Bertal. But parallels appear between the characters in the play and the actors who play them.

Having recently moved into her new apartment, Irène Cazenave, the widow of a well-known police officer, is forced by one of her husband's colleagues to take part in an investigation. The building's provocative concierge has been found murdered. We watch a parade of suspects, only to learn at the end that Irène killed the janitor under blackmail. She kills herself.

Haute Couture model in Paris becomes involved in the activities of two rival jewel thief gangs.

Some gangsters use a young girl to get to a recently released convict who hid $10 million from a robbery just before he was caught.

Anthology film with three shorts each featuring a famous detective: Monsieur Wens, Lemmy Caution and Maigret.