My least favourite Christie/Poirot in the series thus far. Perhaps because I read it in between two instalments of the Game of Thrones series. :-)
At the end of the book, when Poirot unfolds his findings and points out the murderer, I was of course surprised at the ingenuity of Christie (as always), but didn't feel excited or anything else about the story. The book reads more like a dry listing of facts for the detective to use in the last chapter than as a compelling narrative.