Great mystery!! I loved the way it was told, and I always like a character like Hercules Poirot, with weird habits, but a brilliant mind. I had read this story as a kid, many years ago, and I didn't remember much of it, but it was good to read it again. It has a great setting, and a good depicting of the English upper class.
I read little by Agatha Christie, but she's definitely one of the best authors of mystery tales I've ver read. Read it, you won't regret it!