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Tragedy struck on the luxurious Blue Train from London to the French Riviera. The daughter of the famous American millionaire Ruth Kettering was strangled in her own compartment, and all her jewelry, including the amazing ruby, disappeared. The great detective Hercule Poirot, who, of course, could not stay away from the investigation, was traveling on the same train to rest at sea. Everyone around him only says that about a mysterious jewel thief named Marquis, and they are completely sure that this crime is his doing. However, Poirot received information that shortly before the unfortunate woman was found dead, Ruth’s husband, Derek, was leaving her compartment …
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