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Bill Bixby as Prof. Luke Williams |
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Helen Hayes as Lavinia Fullerton |
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Lesley-Anne Down as Bridget Conway |
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Olivia de Havilland as Honoria Waynflete |
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Patrick Allen as Maj. Horton |
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Shane Briant as Dr. Thomas |
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Freddie Jones as Const. Reed |
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Leigh Lawson as Jimmy Lorrimer |
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Jonathan Pryce as Mr. Ellsworthy |
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Ivor Roberts as Vicar |
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Trevor T. Smith as Rivers |
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Anthony Valentine as Abbot |
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Timothy West as Lord Gordon Easterfield |
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Carol MacReady as Mrs. Pierce |
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Diana Goodman as Rose Humbleby |
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Frederick Wolfe as Avery |
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Patrick Wright as Attendant |
| Writing | Agatha Christie | Novel |
| Directing | Claude Whatham | Director |
| Production | Stan Margulies | Producer |
| Art | Ian Whittaker | Art Direction |
| Editing | David Newhouse | Editor |
| Costume & Make-Up | Barry Richardson | Hairstylist |
| Costume & Make-Up | Eddie Knight | Makeup Artist |
| Costume & Make-Up | Ernest Gasser | Makeup Artist |
| Camera | Brian Tufano | Director of Photography |
| Production | David L. Wolper | Executive Producer |
| Sound | Gerald Fried | Music |
| Art | Ann Mollo | Set Decoration |
| Costume & Make-Up | Joan Carpenter | Hairstylist |
| Writing | Carmen Culver | Teleplay |
