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Nigel Patrick as Superintendent Robert Hazard |
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Michael Craig as Inspector Phil Learoyd |
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Yvonne Mitchell as Mildred |
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Paul Massie as David Harris |
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Bernard Miles as Ted Harris |
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Olga Lindo as Mrs. Harris |
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Earl Cameron as Dr. Robbins |
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Gordon Heath as Paul Slade |
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Barbara Steele as Student |
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Peter Vaughan as Detective Whitehead (uncredited) |
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Yvonne Buckingham as Sapphire Robbins |
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Jocelyn Britton as Patsy |
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Robert Adams as Horace Big Cigar |
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Desmond Llewelyn as Police Constable |
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Fenella Fielding as Lingerie Shop Manageress |
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Susan Stranks as Student |
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Freda Bamford as Sgt. Cook |
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Rupert Davies as Ferris |
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Orlando Martins as Barman |
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Harry Baird as Johnnie Fiddle |
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Grace Arnold as Sapphire's Landlady |
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Thomas Baptiste as Man on the Street |
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Victor Brooks as Police Sgt. |
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Basil Dignam as Doctor Burgess |
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Dorothy Gordon as Lily |
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Nora Gordon as Newsagent's Wife |
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Lucy Griffiths as Johnnie Fiddle's Landlady |
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Vanda Hudson as Girl at Tulip Club |
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Dan Jackson as Nightclub Owner |
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Philip Lowrie as Student |
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Bartlett Mullins as Newsagent |
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Philip Ray as Mr. Young |
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Lloyd Reckord as Pianist in International Club |
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John Richardson as Student |
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Richard Vernon as Doctor at Crime Scene |
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Christopher Witty as Boy |
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Dolores Mantez as Student (International Club) |
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Anthony Singleton as Bit Part |
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Geremy Phillips as Youth |
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Joan Hooley as Woman in Street |
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Boscoe Holder as Dancer in Nightclub |
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George Curtis as Police Constable |
| Directing | Basil Dearden | Director |
| Writing | Janet Green | Writer |
| Costume & Make-Up | Julie Harris | Costume Design |
| Editing | John D. Guthridge | Editor |
| Camera | H. A. R. Thomson | Camera Operator |
| Art | Carmen Dillon | Art Direction |
| Camera | Harry Waxman | Director of Photography |
| Production | Michael Relph | Producer |
| Costume & Make-Up | W.T. Partleton | Makeup Artist |
| Sound | Philip Green | Music |
| Sound | Arthur Ridout | Sound Editor |
| Directing | Tilly Day | Continuity |
| Crew | Arthur Alcott | Production Controller |
| Sound | Harry Fairbairn | Sound Assistant |
| Sound | John Dankworth | Musician |
| Crew | Lukas Heller | Additional Dialogue |
| Art | Dickie Bamber | Standby Property Master |
| Production | Douglas Pierce | Production Manager |
| Production | Earl St. John | Executive Producer |
| Directing | David W. Orton | Assistant Director |
| Sound | Bill Daniels | Sound Recordist |
| Sound | Dudley Messenger | Sound Recordist |
