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.
从日本留学归来的陈望道接下了翻译《共产党宣言》的任务，从此改变了人生轨迹；陈独秀、俞秀松、施存统、经亨颐、戴季陶、蔡慕晖等历史人物一一出场。历经时代动荡变革，友朋或牺牲或离去，陈望道面临生死抉择的考验。
