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.

Jean Gabin
as Commissaire Maigret

Annie Girardot
as Yvonne Maurin

Olivier Hussenot
as Lagrume

Jeanne Boitel
as Louise Maigret

Lucienne Bogaert
as Veuve Adèle Maurin

Jean Debucourt
as Camille Guimard

Paulette Dubost
as Mauricette Barberot

Lino Ventura
as Inspecteur Torrence

Jean Desailly
as Marcel Maurin

Guy Decomble
as Mazet