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Glynis Johns as Clarissa Hailsham-Brown |
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John Justin as Henry Hailsham-Brown |
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Jack Hulbert as Sir Rowland Delahaye |
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Cicely Courtneidge as Miss Peake |
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Ronald Howard as Jeremy |
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David Nixon as Elgin |
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Wendy Turner as Pippa |
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Basil Dignam as Hugo |
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Joan Sterndale-Bennett as Mrs. Elgin |
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Ferdy Mayne as Oliver |
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Peter Butterworth as Insp. Lord |
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Anton Rodgers as Sgt. Jones |
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Robert Raglan as Dr. Berry |
| Writing | Albert G. Miller | Writer |
| Writing | Eldon Howard | Writer |
| Directing | Godfrey Grayson | Director |
| Camera | James Wilson | Director of Photography |
| Sound | Tony Crombie | Original Music Composer |
| Production | Edward J. Danziger | Producer |
| Production | Harry Lee Danziger | Producer |
| Costume & Make-Up | Elsie Alder | Hairstylist |
| Editing | Bill Lewthwaite | Editor |
| Art | Norman G. Arnold | Art Direction |
| Costume & Make-Up | Aldo Manganaro | Makeup Artist |
| Writing | Agatha Christie | Theatre Play |
| Art | Peter Russell | Assistant Art Director |
| Writing | Agatha Christie | Story |