This was my first Michael Crichton book and it definitely won't be my last. I read this one several times - it is a very good story and there are a lot of twists and turns, until the ending, which makes you wonder if you would be strong enough to do what the characters did. I think this is one of Creighton's best! Twist after twist, at sometime you will start to think about what is this story about ,aliens?time avail it.if you wanna know buy it and start reading it. Amazing book. Hats off to the genius Michael Crichton. Must read for a deep insight into the ways and designs of the mind. All the pages are intact and clean and there are no marks and over writing on the pages.