I think I need to update my rating for this book. I enjoyed this slow re-read immensely: Not only is the murder mystery pretty good, there is also a serious, dare I say, thoughtful undertone to it. I'm not sure if Dame Agatha intended this, but it just really works for me.
And, yet, the book is also riddled with humor and references to other books in the Christie-verse... I laughed so hard at Poirot's pining over the memory of the Countess, and at the mention of "Herzoslovakia", which is a bonkers invention of Christie's from The Secret of Chimneys.
Yes, I really, really like this one a lot.