This story takes place at the Golden Palm resort on the Caribbean island of St Honoré. Miss Marple's nephew has paid for her to holiday there after a bout of ill health. She speaks with Major Palgrave, a well-travelled man with many stories to share. She sits, half listening, until Palgrave tells a story about a man who got away with murder more than once. When Palgrave asks her if she wants to see a picture of a murderer, she listens intently - but after he looks in his wallet for the photo, he suddenly changes the subject. Miss Marple looks up to see why and spots several people nearby. The next day, when the maid Victoria finds Major Palgrave dead in his room, Miss Marple is convinced he was murdered. She asks Dr Grahame to find the photo he mentioned, pretending it is of her nephew. Meanwhile, she interviews the others: Tim and Molly Kendal, owners of the hotel; the Prescotts, a clergyman and his sister; Mr Jason Rafiel, a tycoon confined to a wheelchair; Jackson, his nurse/masseur/attendant/valet; Esther Walters, his secretary; the American Lucky Dyson and her husband, Greg; and Edward and Evelyn Hillingdon. On the beach, Miss Marple sees Señora de Caspearo, a woman on holiday who says she remembers Major Palgrave because he had an evil eye. Miss Marple corrects her that he had a glass eye, but she still says that it was evil. Victoria informs the Kendals that she did not remember seeing the high blood pressure medication, Serenite, in Major Palgrave's room before his death, although it was found on his table after his death. That night, Victoria is found stabbed to death. Molly begins having nightmares. Miss Marple finds Jackson looking at Molly's cosmetics who says that if belladonna were added to it, it would cause nightmares. The following night, Tim finds Molly unconscious on the floor, apparently having taken an overdose of sleeping pills. The police are involved, and the cook, Enrico, tells them he saw Molly holding a steak knife before going outside. Miss Marple asks the others if Major Palgrave told people about the photo. Others claim Palgrave said it was not a photo of a wife killer but a husband killer. Major Palgrave is exhumed and the autopsy reveals that he was poisoned. At night, Tim wakes up to find his wife is missing. They find what seems to be her body in a creek, but it turns out to be Lucky; the two women resemble one another. Miss Marple wakes Mr Rafiel and they go to Tim and Molly Kendal's house. There they find Tim offering Molly some wine. Miss Marple tells Jackson to take the wine away. She shows it to Mr Rafiel, saying there is a deadly narcotic in it. She explains that Tim is the wife killer, recognised by Major Palgrave. Miss Marple had thought Palgrave saw the Hillingdons and the Dysons on his right as they were coming up the beach, but later realised that he had a glass eye on the right so he could not have seen them. Tim and Molly were sitting on his left. Tim was planning to kill his wife and so had to kill Major Palgrave when he recognised him. He also killed Victoria, who remembered the Serenite. Tim put belladonna in Molly's cosmetics to make her appear mad to the others. Tim had asked his wife to meet him by the creek, but Molly had been distracted by a vision due to the belladonna and wandered off. Tim saw Lucky and mistook her for Molly. He was about to poison Molly when Miss Marple came in. Esther Walters suddenly insists that Tim is not a killer. Tim shouts at her to keep quiet. He had been planning to marry Esther, after Molly's death, because he had heard that she was going to inherit a large sum of money from Jason Rafiel.