I read this because I love the movie, and I am happy I did. It reminded me why the movie was so good, but gave me a new experience with the parts that didn't make it, the little details, and the extensions of things I thought I understood. I still hated the Ben Affleck character the whole time, and it made me laugh out loud when he admitted he knew he was hated. Very omniscient.

I totally recommend this to fans of the movie, but non-fans/people who haven't seen it will want to be in for a suspenseful mystery with some time jumping.