The ABC Murders (S04E01)

Three victims are discovered dead, each accompanied by a copy of the ABC Railway Guide. As the investigation unfolds, it becomes clear that these seemingly random killings are connected by a mysterious pattern. Detective Hercule Poirot takes on the case, piecing together clues that lead him to a cunning and elusive killer. With each new revelation, the tension mounts as Poirot races against time to prevent further murders, all while deciphering the significance of the railway guide in this chilling game of cat and mouse.