Captain Arthur Hastings, invalided in the Great War, is recuperating as a guest of John Cavendish at Styles Court, the "country-place" of John's autocratic old aunt, Emily Inglethorpe - she of a sizeable fortune, and so recently remarried to a man 20 years her junior. When Emily's sudden heart attack is found to be attributable to strychnine, Hastings recruits an old friend, now retired, to aid in the local investigation. With impeccable timing, Hercule Poirot, the famous Belgian detective, makes his dramatic entrance into the pages of crime literature.

Just after midnight, the famous Orient Express is stopped in its tracks by a snowdrift. By morning, the millionaire Samuel Edward Ratchett lies dead in his compartment, stabbed a dozen times, his door locked from the inside. One of his fellow passengers must be the murderer. Isolated by the storm, detective Hercule Poirot must find the killer among a dozen of the dead man's enemies, before the murderer decides to strike again....

Soon after Gwenda moved into her new home, odd things started to happen. Despite her best efforts to modernize the house, she only succeeded in dredging up its past. Worse, she felt an irrational sense of terror every time she climbed the stairs. In fear, Gwenda turned to Miss Marple to exorcise her ghosts. Between them, they were to solve a “perfect” crime committed many years before.