Le môme (1986)

In this action thriller, Richard Anconina is Willie, a young and lonesome cop who loves lonesome cowboy music. While on a drug case Willie comes across a mulatta named Jo (model Ambre of Senegalese extraction), who is trapped in a dismal life of prostitution by two abusive Lebanese brothers. Risking his own life, Willie frees Jo from their fierce imprisonment, but the battered woman runs right back again.