A tyrannical old martinet, a mental sadist and the incarnation of evil. These were only three of the character descriptions levelled at Mrs. Boynton, the matriarch who kept her family totally dependent on her. But did she really deserve to die on the excursion to beautiful Petra? Hercule Poirot hears about the murder and feels compelled to investigate-despite the family's request not to do so. Do they have something to hide and, if so, can they keep it hidden from this master sleuth?