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Jack Watling as Dennis Willows |
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Rona Anderson as Sallie Harbord |
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John Horsley as Peter Hastings |
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Russell Napier as Inspector Simmons |
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Kenneth Kent as Dr. Julian Cole |
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Mary Jones as Florence Cole |
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Alastair Hunter as Sgt. Thorpe |
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Joan Hickson as Miss Edinger |
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John Le Mesurier as Phinneas Tilliard |
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June Ashley as Madeline Tilliard |
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Hélène Burls as Mrs. James |
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Charles Hammond as Juror at Inquest (uncredited) |
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Edward French as Bit Part (uncredited) |
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Peter Gilmore as Bit Part (uncredited) |
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Arthur Gross as Bit Part (uncredited) |
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Pat Hagan as Police Officer at Inquest (uncredited) |
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Neil Hallett as Police Constable Guarding Hastings' Home (uncredited) |
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Humphrey Morton as Usher (uncredited) |
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Bartlett Mullins as Coroner (uncredited) |
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Richard Neller as Juror at Inquest (uncredited) |
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Dandy Nichols as Waitress (uncredited) |
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Alan Robinson as Porter (uncredited) |
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Hugh Stewart as Policeman (uncredited) |
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John Wilder as Police Officer at Inquest (uncredited) |
| Editing | Jack Slade | Editor |
| Directing | Charles Saunders | Director |
| Camera | James Wilson | Director of Photography |
| Writing | Doreen Montgomery | Writer |
| Directing | Joanna Busby | Continuity |
| Sound | Frank Chacksfield | Original Music Composer |
| Editing | Eric Boyd-Perkins | First Assistant Editor |
| Costume & Make-Up | Betty Baugh | Hairstylist |
| Sound | Peter T. Davies | Sound Re-Recording Assistant |
| Costume & Make-Up | Michael Morris | Makeup Artist |
| Sound | A.E. Rudolph | Sound Recordist |
| Camera | Peter Lamb | Clapper Loader |
| Production | Clive Nicholas | Producer |
| Directing | René Dupont | Second Assistant Director |
| Camera | Nobby Smith | Focus Puller |
| Production | Fred A. Swan | Production Supervisor |
| Art | David Butcher | Art Direction |
| Sound | Frank Chacksfield | Conductor |
