Poirot’s early cases

With each case, Poirot further proves his reputation as the greatest mind in detective fiction. In “The Plymouth Express,” the body of the daughter of a wealthy American industrialist is found stuffed under a train seat. “Problem at Sea” finds a disliked rich woman murdered in a locked room on a ship. “The King of Clubs” involves a prince, his dancer fiancée, and a fiendish bit of blackmail.