This episode has two things going for it: a very sympathetic victim, and a repellent culprit who is nevertheless very believable as a type. Added pathos comes from seeing Mrs. Pengelley's fears dismissed and her character derided. The plot here is practically without artifice, with the events developing very naturally. I'm on at least my third viewing of most of the Poirot episodes. This one is underrated, in my opinion. It's one of the best of the short episodes.