Poirot discovers that two other women had been strangled recently. One is Alice Corrigan, who have money and killed while on her way to meet her husband. Her body was found by a gym teacher. Police suspect the husband was the culprit, but he had an alibi to prove his innocence. No evidence of the death of another woman, but the police think it was connected. Poirot invite some guests on a trip and when they returned, they found that Linda was taking too many sleeping pills and wrote a suicide note confessing to the murder of Arlena. However, Poirot realizes that the killer really is Patrick, backed by Christine. Patrick previously killed Alice Corrigan for his money. He began to see Arlena, who gave him a lot of money, but he does not want to have any problems from Mr Marshall, so he decided to kill her before he found out. When Patrick and Miss Brewster found the body on the beach, it was not Arlena but Christine was dressed like her, pretending to be dead. Arlena was hiding in the cave because she felt guilty about arranged to meet Patrick and did not want anyone to see. When Brewster went to see the police, and then hang out Patrick Arlena was strangled her.
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