Blackmail (1947)

Dan Turner, a New York City private detective, is hired to investigate a case involving "Ziggy" Cranston, a rich California playboy and the owner of a national-radio network, who is being blackmailed for $50,000 by a gangster, he thinks, who claims he can prove Cranston murdered a nightclub singer. Cranston gets tagged with another murder, and Turner must get involved in several gunfights and sessions with lovely femme-fatales while figuring out who killed whom.