Maigret investigates Paris bank robberies. He turns his attention to the murder of a burglar, Honoré Cuendet, until the robbers strike again.

Maigret anticipates the robbers' next move and gets the chance to confront Cuendet's killers. But, the robbers have a larger master plan.

The team is interrupted when Maigret is ordered to investigate death threats received by a billionaire businessman, Ferdinand Fumal.

As Maigret reels from regret, he suffers a blow in his personal life. Maigret digs into Fumal's life in order to understand him better.

A student is stabbed to death in the street. Maigret digs into the killer's psychology. Countess Sophie calls, fearing for her life.

Tragedy strikes in Saint-Fiacre as Maigret digs into secrets. Back in Paris, Maigret's talks with the killer have terrifying consequences.