Found this at a local used book store for $1. I loved the movie so I decided to buy it. This is NOT the novel The Exorcist, but rather the first draft screenplay and explanations by the author why changes were made from novel to film, where the story came from, etc. I've not read the actual novel, but now I want to just to see the similarities and differences. Yes, it was pretty creepy (as to be expected) and I now understand the story better. I would recommend this quick read for anyone who liked the novel or film The Exorcist.