This was Joan Hickson's third appearance in forty-three years in a screen adaptation of a Dame Agatha Christie story or novel, following A Night of Terror (1937) and Murder She Said (1961). Hickson subsequently played Christie's character Miss Jane Marple twelve times in eight years in a series of television movies, including Agatha Christie's Miss Marple: 4:50 from Paddington (1987).
James Warwick and Francesca Annis later appeared together in "The Secret Adversary" and "Partners in Crime", as married sleuths Tommy and Tuppence Beresford. The episodes were adapted from an Agatha Christie novel and a short story collection.
Final film of Elaine Wells.
John Horsley and Joan Hickson both appeared in Miss Marple: Nemesis.