It's a unique story, especially for the Poirot mysteries. I remember thinking at one point, could Number Four, be Captain Hastings?!

About a quarter way into the book, I suspected almost everyone; I even had a moment where I thought perhaps Poirot could have been involved!

I’m inspired by Agatha’s skills to mislead the reader. You always think you know who did it until the end, and you’re once again blown away.