When his mother eloped with an Italian opera singer, Louis Mazzini was cut off from her aristocratic family. After the family refuses to let her be buried in the family mausoleum, Louis avenges his mother's death by attempting to murder every family member who stands between himself and the family fortune. But when he finds himself torn between his longtime love and the widow of one of his victims, his plans go awry.
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| Camera | Douglas Slocombe | Director of Photography |
| Production | Michael Balcon | Producer |
| Editing | John Jympson | Assistant Editor |
| Costume & Make-Up | Anthony Mendleson | Costume Design |
| Art | Bert Davey | Assistant Art Director |
| Writing | John Dighton | Screenplay |
| Sound | John W. Mitchell | Sound Recordist |
| Sound | Wolfgang Amadeus Mozart | Music |
| Production | Michael Relph | Associate Producer |
| Costume & Make-Up | Harry Frampton | Makeup Artist |
| Editing | Seth Holt | Editorial Services |
| Editing | Peter Tanner | Editor |
| Writing | Robert Hamer | Screenplay |
| Directing | Robert Hamer | Director |
| Writing | Roy Horniman | Novel |
| Sound | Ernest Irving | Original Music Composer |
| Sound | Ernest Irving | Conductor |
| Production | Hal Mason | Production Supervisor |
| Directing | Norman Priggen | Assistant Director |
| Editing | Roy Baker | Assistant Editor |
| Production | Leigh Aman | Unit Production Manager |
| Art | William Kellner | Art Direction |
| Costume & Make-Up | Barbara Barnard | Hairstylist |
| Costume & Make-Up | Ernest Taylor | Makeup Artist |
| Writing | Nancy Mitford | Screenplay |
| Crew | Sydney Pearson | Special Effects |
| Sound | Stephen Dalby | Sound Director |
| Costume & Make-Up | Pearl Orton | Hairstylist |
| Camera | Jeff Seaholme | Camera Operator |
| Directing | Phyllis Crocker | Continuity |
| Costume & Make-Up | Daphne Martin | Hairstylist |
| Crew | Geoffrey Dickinson | Special Effects |
| Sound | Philharmonia Orchestra | Music |
