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Eleanor and Roddy were planning their wedding. They were full of hope for a happy married life. In addition, Elinor was the only heir to her rich Aunt Laurie, who was seriously ill. But a letter from an anonymous person who signed himself "Well-Wisher" ruined everything. He hinted to Elinor that her aunt's pupil Mary Gerrard might claim the inheritance. A few days later, Aunt Laurie was found dead. Soon afterwards, young Mary also dies. Evidence points to Elinor as the only surviving heir. Moreover, the girl suddenly confesses to the crime herself. But the legendary detective Hercule Poirot suspects that everything is not so obvious. He already knows that someone else is involved in this bizarre story...