Maigret investigates the murder of a stripper, finding himself mixing with the low life types of Montmartre.

No one knows what William Brown does when he visits Cannes every month, but one day he returns with a knife in his back.

Professor Gouin, a brilliant surgeon, but a man that 'does not know what makes people tick' is caught in the drama of murder.

Based on his 1932 novel L'Affaire Saint-Fiacre. Maigret returns to the village where he was born and becomes convinced he witnessed the Countess of Fiacre's murder.