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.
| Directing | Robert Hamer | Director |
| Editing | Peter Tanner | Editor |
| Writing | John Dighton | Screenplay |
| Production | Michael Balcon | Producer |
| Writing | Robert Hamer | Screenplay |
| Camera | Douglas Slocombe | Director of Photography |
| Writing | Roy Horniman | Novel |
| Sound | Ernest Irving | Original Music Composer |
| Writing | Nancy Mitford | Screenplay |
| Costume & Make-Up | Harry Frampton | Makeup Artist |
| Costume & Make-Up | Pearl Orton | Hairstylist |
| Costume & Make-Up | Ernest Taylor | Makeup Artist |
| Editing | John Jympson | Assistant Editor |
| Production | Leigh Aman | Unit Production Manager |
| Editing | Roy Baker | Assistant Editor |
| Costume & Make-Up | Barbara Barnard | Hairstylist |
| Costume & Make-Up | Daphne Martin | Hairstylist |
| Production | Hal Mason | Production Supervisor |
| Directing | Norman Priggen | Assistant Director |
| Crew | Sydney Pearson | Special Effects |
| Art | William Kellner | Art Direction |
| Editing | Seth Holt | Editorial Services |
| Production | Michael Relph | Associate Producer |
| Costume & Make-Up | Anthony Mendleson | Costume Design |
| Art | Bert Davey | Assistant Art Director |
| Camera | Jeff Seaholme | Camera Operator |
| Crew | Geoffrey Dickinson | Special Effects |
| Sound | Stephen Dalby | Sound Director |
| Sound | Ernest Irving | Conductor |
| Directing | Phyllis Crocker | Continuity |
| Sound | Wolfgang Amadeus Mozart | Music |
| Sound | John W. Mitchell | Sound Recordist |
| Sound | Philharmonia Orchestra | Music |
