S12E04 - Appointment with Death

Holidaying in Jerusalem, Poirot overhears Raymond Boynton telling his sister: "You do see, don't you, that she's got to be killed?" Their mother, Mrs. Boynton, is a sadistic tyrant who dominates all the younger members of her family, and who attracts the strong dislike of a group of people outside the immediate family. But when she is found dead, there are only twenty-four hours for Hercule Poirot to solve the case and he has no way of even proving whether it was murder.

The storyline deviates significantly from the original novel.