Richard Bruce, an American in fog bound London stumbles into the midst of international intrigue, with Rose Thorne, an innocent dupe. Together they try to unravel the mystery, enlisting the aid of a cat burglar named Holmes, who they bump into along the way.
| Writing | Ruth Rose | Writer |
| Directing | Ernest B. Schoedsack | Director |
| Crew | Robert Benchley | Additional Dialogue |
| Production | Merian C. Cooper | Executive Producer |
| Sound | Roy Webb | Original Music Composer |
| Directing | Ivan Thomas | Assistant Director |
| Editing | Ted Cheesman | Editor |
| Camera | Henry W. Gerrard | Director of Photography |
| Costume & Make-Up | Walter Plunkett | Costume Design |
| Sound | Hal Bumbaugh | Sound Recordist |
| Sound | Max Steiner | Music Director |
| Production | David Lewis | Associate Producer |
| Art | Van Nest Polglase | Settings |
| Art | Alfred Herman | Settings |
| Camera | Ollie Sigurdson | Still Photographer |
| Camera | Tom Clement | Grip |
