A young policeman searches for the murderers of his drug addict sister. While he carries out his investigations, the criminals manage to get him charged with murder.

Rosa la Rose is the most beautiful prostitute of Les Halles. Every client wants her and she accepts everything. Her pimp is a sympathetic and generous man and there is not much to tell about Rosa’s life. Until one day she meets Julien, a young guy, and falls in love with him. But will it be worthy to leave her life for a madness love?