Author/explorer John W. Vandercook conceived the character of Bertram Lynch as an investigator for the League of Nations. He is Trinidad's Port o' Spain trying to track down the leader of a gang of diamond smugglers. A trail, littered with murders, leads him to a crocodile-infested swamp.
| Crew | Bud Geary | Stunts |
| Writing | Seton I. Miller | Writer |
| Editing | Alfred DeGaetano | Editor |
| Production | Sol M. Wurtzel | Producer |
| Directing | Louis King | Director |
| Costume & Make-Up | Royer | Costume Design |
| Sound | Samuel Kaylin | Music Director |
| Writing | John W. Vandercook | Novel |
| Camera | Barney McGill | Director of Photography |