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 | Edward Locke | Theatre Play |
| Writing | Lynn Starling | Screenplay |
| Directing | George Waggner | Director |
| Writing | Curt Siodmak | Adaptation |
| Writing | Curt Siodmak | Screenplay |
| Art | Russell A. Gausman | Set Decoration |
| Camera | W. Howard Greene | Director of Photography |
| Editing | Russell F. Schoengarth | Editor |
| Production | George Waggner | Producer |
| Art | John B. Goodman | Art Direction |
| Art | Ira Webb | Set Decoration |
| Production | Joseph Gershenson | Executive Producer |
| Sound | Edward Ward | Original Music Composer |
| Costume & Make-Up | Vera West | Costume Design |
| Camera | Hal Mohr | Director of Photography |
| Art | Alexander Golitzen | Art Direction |
| Costume & Make-Up | Jack Pierce | Makeup Artist |
| Directing | Charles S. Gould | Assistant Director |
| 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 |
