Incredibly smart and thrilling! 
 It was interesting reading this a second time. While I knew who the culprit was going into this reread, I was still incredibly fascinated by how elaborate everything seemed to be. It's also interesting how obvious everything was in the end, but I was so engrossed in the mystery of it all that I can definitely see how I completely missed it. 
 I definitely recommend this if you are a fan of mystery (Agatha Christie is the queen of mystery after all)!