The film is an investigation about a young woman's murder (not shown on-screen). Prostitution is mentioned frequently in the first part. In the first scene of the movie, a woman (in her underwear) is shown being uncomfortable while a female tailor helps her get dressed. In one brief scene, a woman tries to kiss another woman, who rebuffs her. One male character is said to be violent towards women: it is said that his mother settled a judiciary case involving physical (i.e. sexual) abuse with money. A woman is tricked by a couple, who invites her to their apartment to force her to perform sexual acts for money with the woman while the man watches and masturbates. The titular character (a male captain) encourages her to go there to solve the murder, without knowing exactly what would happen to her. She is shown afterwards being traumatized. It is then revealed that the said couple regularly framed young women with the same method, including the victim of the murder (who is 20, i.e. minor in 1950s France). Worthy of note: it is said that the victim was not raped, but her bloody dress (from knife wounds) is shown several times in the first part of the movie.