Vice Squad (1982)

A Los Angeles whore known only by her street name of Princess, turns to prostitution to support herself and her young daughter when she s forced by Detective Tom Walsh and his vice squad to help them arrest a brutal pimp named Ramrod for the murder of a prostitute named Ginger. But when Ramrod learns that he was set up, he escapes from police custody and begins a long night of tracking down Princess while Walsh and his vice squad are always one step behind him