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
老太火车看到凶杀，周五。老太应聘当女仆周一。周二，老太发现女尸，报警。周五晚，庄园亲戚大聚会。周二，或周三，女儿就拿出一封法语信。那么信是医生什么时候准备的？邮戳怎么解决？
女尸如果每毁容，家里这么多亲戚难道没人认识已故兄弟的妻子？
所以医生的设计不高明啊。
医生冒那么大风险，在人来人往的火车上大白天杀人，抛弃尸，再背尸到自己女朋友家，放在古埃及棺材里，图什么？等人报案发现？引火烧身，嫁祸其他兄弟？链条太多，不可信。
音乐盒，不是被警察拿走？怎么又跑到侄子手里？