Maigret sets out to catch a serial killer.

Maigret's patience is tested when the crime boss he has investigated for years, Manuel Palmari, commits another jewellery heist. But when Palmari himself is murdered, Maigret works with the criminal's shady mistress, Aline, to find the killer.

Alfred Jussiaum is a safecracker. While he's on the job he finds the dead body of a woman in the house he's robbing. Afraid, he leaves town and asks his wife Ernestine to go to inspector Maigret and report the murder. Maigret goes to the house and the owner a dentist who lives with his mother denies there ever was a robbery much less a murder. Maigret is not convinced and he soon finds out that the doctor's wife who supposedly travelled to Holland the day of the murder hasn’t reached her destination and is nowhere to be found. Someone is lying!

Maigret is accused of trying to seduce a 17-year-old niece of a high-ranking public official.

The Minister of Public Works asks Maigret to investigate the theft of a government report.

Maigret investigates the murder of Peg Leg, who has been shot in his room. He appears to have been entertaining a guest, but the housekeeper denies that anyone else was there.

Maigret is asked by an old schoolfriend to investigate the murder of his lover.

A stripper reports a conspiracy to murder a countess and is found strangled.

An old lady believes that there has been an intruder in her apartment, but before Maigret has a chance to investigate, he learns that she has been murdered in her apartment.

Maigret responds to a warning that a crime is to be committed in the church in his home town during the first mass on All Soul's Day.

A schoolmaster from a small fishing village arrives at Maigret's office claiming he's about to be wrongly arrested for murdering the town's disliked postmistress. Maigret travels to the village and discovers a conspiracy of vast proportions amid surly, distrusting villagers.

Maigret investigates when the wife of an American industrialist is found strangled in the kitchen of the Hotel Majestic.