I've read the four books in the saga. New Moon (the movie) was pretty true to the book. There were details not in the movie (mainly what circumstances created the pack and why they shifts into wolf form but reading the book would provide that information). Keep in mind, there's only so much time for a movie so combining the book with the movie will provide a much better experience. I thought the wolves were a bit huge and whatever was used to create the images was not really smoothe.