After a gunfight, Laurence is left blind. Meanwhile a child is found drowned in a bucket of water. Laurence decides to hide his condition to investigate himself. He is then forced to work closely with Avril, who becomes his eyes.

Superintendent Laurence and Alice Avril are invited to a special diner, involving unsolved crimes. During the evening their host is killed and everyone becomes a suspect, even superintendent Laurence.

Avril goes undercover in a cabaret where a waitress was killed, and the boss kidnapped. Superintendent Laurence has to deal with an inspector from the "police of the police" who wants him removed from the investigation.