At the insistence of Ruth Van Rydock, an old schoolfriend who is convinced that there is something wrong, Miss Marple agrees to visit 'Stonygates', the country house of Ruth's sister.
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| Camera | John Walker | Director of Photography |
| Directing | Norman Stone | Director |
| Writing | T.R. Bowen | Writer |
| Editing | Bernard Ashby | Editor |
| Costume & Make-Up | Brian Willis | Costume Designer |
| Writing | Agatha Christie | Novel |
| Production | Ian R. Wallace | Associate Producer |
| Production | George Gallaccio | Producer |
