Inspector Maigret and his wife's Belgian vacation is cut short when Mrs. Maigret get appendicitis. Returning from her bedside, Maigret discovers a note in his pocket about his wife's hospital roommate; the sister-in-law of the surgeon who operated on Mrs. Maigret. Murder is in the air, and Maigret begins an unauthorized investigation.
What begins as a routine trip to his hometown of Saint-Fiacre turns into work, as Inspector Maigret arrives just in time to witness a murder. Childhood memories return to haunt him as his investigation begins. Can he perform with his customary excellence in the place of his humble beginnings?
A man is found wandering the streets of Paris, mute and amnesiac. Under the old wig that overhangs his blank stare, the police discover a shaven head, and a gunshot wound that has been meticulously stitched. Inspector Maigret is on the case.
Inspector Maigret is determined to prove the innocence of a man sentenced to death for the murders of an American woman and her maid. The stakes are high as Maigret tries to find the real killer.