Colette Richard

Walter, a reporter and photographer, meets Catherine in a train. The young lawyer recently gained an acquittal for a man who killed his alcoholic father to save his mother. Campaigning against alcoholism, she asks Walter to help her unmask a wine merchant engaged in shady practices.

François, a young student at a provincial college, likes Colette, the daughter of the headmaster. Turlot his colleague, who commits suicide, left a diary where he writes of his relationship with Colette.

Loiseau the pharmacist mistakenly mixes potassium cyanide into a batch of cough syrup and sells five bottles. With horror he discovers his mistake and sets out to find the buyers. He finds only four. The fifth, not a regular customer, comes back to the pharmacy...