Policeman Jean Letellier is under pressure because the infamous gangster Marcucci escaped from him publicly. Moreover during the pursuit an innocent bystander was killed by a stray bullet. Letellier is investigated for having fired the deadly bullet. Before Letellier is cleared, a serial killer begins to murder young women, each time leaving a weird message at the site of crime. He calls himself "Minos", referring to the Divine Comedy. The murderer always declares he had punished his victims for what he considers their impure life style.
