Superintendent Larosière and Inspector Lampion investigate the murder of a woman last seen entering a theater. Based on the Hercule Poirot novel Lord Edgeware Dies.

Feeling underappreciated, Lampion leaves his post to a join a private investigation firm, and gets a lead on a 15-year-old case. Based on the Hercule Poirot novel.

After Inspector Lampion is injured during a police raid, Superintendent Larosière rents a cottage in a small village and begins receiving threatening letters. Based on the Miss Marple novel.

A freshly severed head is found in the coffin of a young woman.

One evening, old Auguste drops dead among the customers at his restaurant. He leaves three sons. Of these, Antoine was his partner in the old bistrot. The two others are mostly worried about the inheritance, suspecting Antoine of robbing the old man.

Delaunay and Mizon have to trap a particularly tough and manipulative killer.

Agnes and Thibaud investigate when a frozen body is found in the mountains.

A woman finds her philandering husband dead.

The concierge of a luxury hotel is investigated for murder.

A dentist murders his assistant and gets an alibi from his wife.