A decent book, with some scary, suspenseful elements - but, to be honest, not nearly as scary as I had expected. This is my first time reading Dean Koontz, so I don't know if his other books are scarier, or if I'm just jaded, or if Hollywood has burned from me the ability to be scared by something as pedestrian as aliens (even aliens with faces in their hands). Or maybe I lack the imagination necessary to fully comprehend the horrible scenes described here. To be honest, the things that scared me the most were those that were closer to the realm of possibility - walls full of bugs, fungus with worm-like innards, a woman trapped in a restroom with a psychopathic killer.
I don't think it's spoiling the surprise to say there's a definite religious undertone running through the book. I picked up on it fairly early on, when Neil's brother quotes scripture about the devil "having great wrath because he knoweth he hath but a short time." It was interesting to see this intersection of Revelation, alien invasion, psychopathic killer, and just general monster-type horror, all in one book.