Dr. Hohner, theatre physician at the Vienna Royal Theatre, murders his mistress, the star soprano when his jealousy drives him to the point of mad obsession. Ten years later, another young singer reminds Hohner of the late diva and his old mania kicks in. Hohner wants to prevent her from singing for anyone but him, even if it means silencing her forever.
| Writing | Curt Siodmak | Screenplay |
| Writing | Lynn Starling | Screenplay |
| Writing | Edward Locke | Theatre Play |
| Writing | Curt Siodmak | Adaptation |
| Directing | George Waggner | Director |
| Sound | Edward Ward | Original Music Composer |
| Costume & Make-Up | Jack Pierce | Makeup Artist |
| Camera | Hal Mohr | Director of Photography |
| Directing | Charles S. Gould | Assistant Director |
| Art | Russell A. Gausman | Set Decoration |
| Production | Joseph Gershenson | Executive Producer |
| Editing | Russell F. Schoengarth | Editor |
| Production | George Waggner | Producer |
| Art | Alexander Golitzen | Art Direction |
| Art | John B. Goodman | Art Direction |
| Camera | W. Howard Greene | Director of Photography |
| Art | Ira Webb | Set Decoration |
| Costume & Make-Up | Vera West | Costume Design |
| Sound | Bernard B. Brown | Sound Director |
| Sound | William R. Fox | Sound |
| Visual Effects | John P. Fulton | Visual Effects |
| Sound | Edward Ward | Music Director |
| Sound | Harold Zweifel | Orchestrator |
