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OldmissMarpleisonatrainridewhenshewitnessesamurderinapassingtrain.Shereportsittothepolicebuttheywon'tbelieveher:sincenobodycanbefoundtherecan'thavebeenanymurder,right?Asalways,shebeginsherowninvestigation.ThemurderwascommittedwhilepassingAckenthorpeHallandmissMarplegetsherselfajobthere,mixingcleaningandcookingwhilesearchingthehouseforclues.