A letter for Miss Marple from a recently deceased friend promises a large reward for investigating a crime - without telling her who was involved, or when it happened! When she accepts, she is given a reservation for a coach tour of historic homes and gardens. She has fifteen fellow-passengers - and one of them knows a murderer's secret and someone is preparing to kill. 　　译文(2): 一位最近去世的朋友给马普尔小姐写了一封信，信中承诺，如果她调查一起犯罪案件，将会得到一大笔奖金——但是没有告诉她谁参与了这起案件，或者案件是什么时候发生的！当她接受时，她被给予一个旅游大巴旅游的历史住宅和花园的保留。她有十五个乘客其中一个知道凶手的秘密有人准备杀人。