Four women were murdered, each was knifed and, though they had their clothes torn, they weren’t molested. As the famed police inspector Jules Maigret pieces the clues together, he comes to realize that for the elusive man that he suspects to be unmasked, he has to set him a trap.

In this classic of French suspense, the cruel and abusive headmaster of a boarding school, Michel Delassalle, becomes the target of a murder plot hatched by an unlikely duo — his meek wife and the mistress he brazenly flaunts. The women, brought together by their mutual hatred for the man, pull off the crime but become increasingly unhinged by a series of odd occurrences after Delassalle’s corpse mysteriously disappears.