After a whirlwind romance in Mexico, a beautiful heiress marries a man she barely knows with hardly a second thought. She finds his New York home full of his strange relations, and macabre rooms that are replicas of famous murder sites. One locked room contains the secret to her husband's obsession, and the truth about what happened to his first wife.
Is Secret Beyond the Door on Netflix? Unfortunately the movie Secret Beyond the Door is not yet available on Netflix.
| Camera | Stanley Cortez | Director of Photography |
| Writing | Silvia Richards | Screenplay |
| Editing | Arthur Hilton | Editor |
| Costume & Make-Up | Travis Banton | Costume Design |
| Directing | Fritz Lang | Director |
| Art | Max Parker | Production Design |
| Sound | Miklós Rózsa | Original Music Composer |
| Art | John P. Austin | Set Decoration |
| Production | Walter Wanger | Executive Producer |
| Production | Fritz Lang | Producer |
| Art | Russell A. Gausman | Set Decoration |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Writing | Rufus King | Story |
| Directing | William Holland | Assistant Director |
| Visual Effects | Robert Cormack | Animation |
| Crew | Walter Wanger | Presenter |
| Costume & Make-Up | Carmen Dirigo | Hairstylist |
| Sound | Leslie I. Carey | Sound |
| Sound | Glenn E. Anderson | Sound |
| Sound | Eugene Zador | Orchestrator |
