When an employee at an illegal gambling den dies suspiciously, her sister, Nancy, looks into the situation and falls for Johnny O'Clock, a suave partner in the underground casino. Selfish and non-committal by nature, Johnny slowly begins to return Nancy's affection and decides to run away with her, but conflict within his business threatens their plans. As Johnny tries to distance himself from the casino, his shady past comes back to haunt him.
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| Writing | Robert Rossen | Screenplay |
| Directing | Robert Rossen | Director |
| Camera | Burnett Guffey | Director of Photography |
| Production | Jerry Giesler | Producer |
| Art | Stephen Goosson | Art Direction |
| Art | Newsboy Brown | Props |
| Art | Bill Black | Props |
| Camera | Ned Scott | Still Photographer |
| Editing | Warren Low | Editor |
| Art | Cary Odell | Art Direction |
| Art | James Crowe | Set Decoration |
| Editing | Al Clark | Editor |
| Sound | Jack Haynes | Sound Recordist |
| Crew | Wally Rose | Stunts |
| Sound | George Duning | Original Music Composer |
| Sound | Morris Stoloff | Music Director |
| Sound | Arthur Morton | Orchestrator |
| Costume & Make-Up | Jean Louis | Costume Design |
| Crew | Joe Palma | Stunts |
| Crew | John P. Barrett | Technical Advisor |
| Production | George Lait | Publicist |
| Production | Milton Holmes | Associate Producer |
| Crew | Leo Schlesinger | Stunts |
| Writing | Milton Holmes | Original Story |
| Production | Edward G. Nealis | Producer |
| Directing | Carl Hiecke | Assistant Director |
