Riff-Raff (1947)

This action-packed film noir stars Pat O'Brien. In Panama, American private eye Dan (O'Brien) hopes to get his hands on a valuable map showing priceless oil concessions. He finds himself up against a formidable cartel of villains headed by Molinar (Walter Slezak), who likewise seek the map—and are willing to commit murder to get it. Mixed up in the proceedings is worldly nightclub singer Maxine (Anne Jeffreys), whom O'Brien immediately distrusts.