简介：　　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&#39t believe her: since no body can be found there can&#39t 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.