This is the lowest rating I've given a Poirot mystery, but absolutely deserved in my opinion. First of all, the circumstances around the murders in this mystery are soooo far-fetched. There are just too many overlooked and unaddressed potential complications, and I'm surprised Christie put this forward as finished. Plus, the ending with the relationship between ______ and _____?! No. It has the "ick" factor for me and goes against medical ethics. Just no. Mrs. Oliver's involvement, one of my favorite secondary characters, couldn't even save this one. Disappointing.