This novel is widely feted as Christies masterpiece, due to the fact it is the most dramatised, but it does not comapre to 'The ABC murders' or 'And Then There Were None', or even 'The Murder Of Roger Ackroyed', that said it is one of the most devious. If anyone solves this murder before the conclusion (and without prior knowledge) I would be very surprised, and essentially that is what we want from Christie, a conclusion that is a complete revelation.
At first, I must admit, the conclusion seemed very far fetched, but then one goes away and considers it is not really so, and that the cryptic clues were all in fact directing us to the truth.
The thing I love about Christie, apart from her undeniable geniues, is her style. I mean, it is so easy to read. Her descriptions are so cursory they essentially allow our imaginations to roam, and everyone will have a different mental image of scenery and events. The characters are very much of their era, and very quaint.
If you want a true puzzle, if you love Christie, or even if not, this is essential reading. The clues are all there for the reader, but if you piece them together and breach Christies twist (I term it as such, because all her novels essentially contain a twist, that if you can see through it the story falls into place), you will adore this book.