This is the second time I've read this novel, the first was many years ago, when I was a girl. I remember being completely blown away. Even though this was a re-read, I felt the same this time. Is it as long and complex as the newer mysteries? No. Does it have tons of gory details? No. Is it clever and twisty? Yes, absolutely.
This is one of my top five Christies, and I've read them all.