Who would've thought it was written by THE John Carpenter? I'm not sure I would've rated this book 4 stars if I weren't Catholic, but I am, so I did. Probably too much jargon and ritual for the uninitiated. The middle 1/3 of the book was checking-under-the-bed creepy. And the morning I woke up to "Chemosh" as my first thought, I knew I'd better not fall asleep again with this book at my side. Movie material? Not sure, but thankfully, for my return to dreamless sleep, the last third of the book read more like a movie script with a predictable ending.