Agent Walter Brown moet kroongetuige Neall van Chicago naar Los Angeles met de trein vervoeren, zodat zij kan getuigen tegen de maffia. Onderweg worden ze van alle kanten belaagd door maffia-leden die haar het liefst dood zouden willen hebben.
Nee, helaas is The Narrow Margin nog niet beschikbaar op Netflix in Nederland.
| Directing | Richard Fleischer | Director |
| Writing | Earl Felton | Screenplay |
| Production | Stanley Rubin | Producer |
| Camera | George E. Diskant | Director of Photography |
| Editing | Robert Swink | Editor |
| Writing | Martin Goldsmith | Story |
| Writing | Jack Leonard | Story |
| Directing | William Cameron Menzies | Co-Director |
| Art | Albert S. D'Agostino | Art Direction |
| Art | Jack Okey | Art Direction |
| Art | Darrell Silvera | Set Decoration |
| Costume & Make-Up | Adele Balkan | Costume Design |
| Directing | William Dorfman | Assistant Director |
| Sound | Clem Portman | Sound |
| Sound | Francis M. Sarver | Sound |
| Art | William Stevens | Set Decoration |
