As I said in the title it's very very good .... Douglas Preston spent the first 20 pages, as in many books, we do not get bored until the end .... Certainly many times, we come to anticipate the actions of our heroes but it does not matter we are so taken by the story, by the action that is forgivable .. This is not a story or you need to think so ideal for relaxing with action. For lovers of paleontology, prehistory you will be served, especially if you love the T-rex.