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In page A Caribbean Mystery:

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A BBC TV adaptation starring Joan Hickson was shown in 1989 as part of the series Agatha Christie's Miss Marple, with Donald Pleasence co-starring as Mr Rafiel.[citation needed] Changes were made from the novel: the Prescotts and Señora de Caspearo were omitted, Miss Marple holidayed on Barbados rather than the fictional island of "St Honoré",[2] and the blood pressure medication Serenite was renamed Tetrawolfide.[citation needed]