I read both Da Vinci Code and Angels and Demons. I thought Da Vinci code, the book, was great, and I thought the movie was just as great. I thought that movie followed the book well. I was disappointed after reading Angels and Demons. I didn't feel any action or deliberation. Langdon just seemed to figure everything out. But I liked the last few chapters where they explained everything. The movie did not follow the book at all. They left alot of important things out. I couldn't enjoy the movie because I just kept saying "They left out..." and "it didn't happen that way in the book" I'm surpised Dan Brown let them change his book so much!