A young woman tries to convince Maigret that the death of the cultured woman she worked for was actually a homicide. She accuses the victim's family, but the local judge defends the family on the basis of their high social standing and tells Maigret that her allegations are preposterous and should be disregarded.

Mid-August in Paris, and Maigret is due to leave on vacation. His travel plans get interrupted when a 60-year-old woman is killed in her own apartment. The police suspect it may be the latest murder committed by a serial killer. The same night, anonymous calls for police assistance come in from all over Paris, as if someone's trying to send a cryptic message.

While staking out a boarding-house where is staying Emile Paulus, a suspect, Detective Archambaud is wounded by a bullet shot from an undetermined place. To further the investigation, Maigret, his superior, decides to put up at the boarding-house posing as an ordinary guest. He is welcomed by Mademoiselle Clément, the dignified owner, and soon discovers the various people living in the place. He also takes a special interest in a woman who dwells in a neighboring block of flats, Françoise Boursicault, the lonely crippled wife of a purser most of the time at sea... A ...

A man is killed in a hotel in Paris. Maigret meets there a young woman who says she is a prostitute. But it seems to Maigret she is not what she wants him to believe... This seems to become the very last Bruno Cremer's Maigret.