During an annual board of trustees meeting, one of the trustees dies. Miss Marple thinks he’s been poisoned after finding a chemical on him. She sets off to investigate at the ship where he had just come from. The fourth and final film from the Miss Marple series starring Margaret Rutherford as the quirky amateur detective.
| Directing | George Pollock | Director |
| Writing | David Pursall | Screenplay |
| Writing | Jack Seddon | Screenplay |
| Writing | Agatha Christie | Novel |
| Production | Ben Arbeid | Producer |
| Production | Lawrence P. Bachmann | Producer |
| Sound | Ron Goodwin | Original Music Composer |
| Camera | Desmond Dickinson | Director of Photography |
| Editing | Ernest Walter | Editor |
| Production | Irene Howard | Casting |
