Identité Judiciaire plot
Young Denise has run away from home and committed suicide by jumping into the canal. It is discovered that she had used narcotics. Two other women are found unconscious on the streets of Paris. One of them, Madame Sannois, refuses to provide information about what she has been through. Commissioner Basquier, assisted by Inspector Paulhan, learns that the drug supplier, Petrosino, is a regular at the inn run by Dora Dourbon. When he visits her, he finds that she has also taken drugs or that they were administered to her. In the clinic she regains consciousness, but she can't remember anything either. Until a few days later she gives some indications.