The Mystery of the Blue Train

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Set against the backdrop of the Blue Train, the investigation into the murder of American heiress Ruth Kettering and the theft of her prized ruby, the 'Heart of Fire,' unfolds. Poirot delves into the lives of various characters, including the victim's father, maid, estranged husband, and eccentric cousins, each with their own secrets. As he interviews the peculiar passengers, the intricate web of relationships and motives gradually reveals the truth behind the tragedy.