Shanghai, China. The last expatriate Westerners still living in the city are imprisoned in a hotel by the communist authorities in order to find the spy hiding among them.
| Directing | Frank Lloyd | Director |
| Writing | Steve Fisher | Screenplay |
| Writing | Seton I. Miller | Screenplay |
| Writing | Lester Yard | Novel |
| Camera | Jack A. Marta | Director of Photography |
| Art | William Flannery | Art Direction |
| Sound | R. Dale Butts | Original Music Composer |
| Directing | William Beaudine Jr. | Assistant Director |
| Sound | Earl Crain Sr. | Sound |
| Sound | Howard Wilson | Sound |
| Costume & Make-Up | Adele Palmer | Costume Designer |
| Art | Edward G. Boyle | Set Decoration |
| Art | John McCarthy Jr. | Set Decoration |
| Editing | Tony Martinelli | Editor |
| Crew | Howard Lydecker | Special Effects |
| Crew | Theodore Lydecker | Special Effects |
| Costume & Make-Up | Bob Mark | Makeup Supervisor |
| Costume & Make-Up | Peggy Gray | Hairstylist |
| Production | Frank Lloyd | Associate Producer |
| Production | Herbert J. Yates | Producer |
