David Ross (Darren McGavin) is a low-rent private investigator. Ross is also an ex-con who spent time in jail for a crime he didn't commit. As a result, he isn't allowed to carry a gun, is harried by the police, and often finds himself on the receiving end of a beating. A theater manager hires Ross to find out if an employee is embezzling. But, when Ross finds the girl's dead body in his own apartment, he becomes the prime suspect in her murder.