Old miss Marple is on a train ride when she witnesses a murder in a passing train. She reports it to the police but they won't believe her: since no body can be found there can't have been any murder, right? As always, she begins her own investigation. The murder was committed while passing Ackenthorpe Hall and miss Marple gets herself a job there, mixing cleaning and cooking while searching the house for clues. 　　译文(2): 马普尔老太太在火车上目睹了一起火车上的谋杀案。她向警察报案，但他们不相信她: 既然找不到尸体，就不可能发生谋杀，对吗？像往常一样，她开始了自己的调查。谋杀发生在路过阿肯索普大厅的时候马普尔小姐在那里找了份工作，一边打扫一边做饭同时搜查房子寻找线索。