I thought I owned and had read every Agatha Christie book, but somehow I missed this one. It's quite unlike her other work. The first 3/4 of the book is about the main character's relationship, courtship, and marriage, then boom! Typically Christie plot twist. All of the pieces fell together. She really was the master of mystery.

This is seriously one of her most WTF books. Well played, Agatha. I'm still thinking about this one.