I will kill you, but you will laugh at my delivery.
There will be spoilers, but it was over 20 years ago!
Dean Koontz is sort of mixed bag in general. His books are never complicated, instead choosing a single idea (usually) and fleshing it out into 400 pages. I try to always have a book I am reading for pleasure, finding it important for my writing, and life in general. Koontz is who I turn to when I actually don't feel like reading.
Like most of his books, I spent most of the time reading words in the background as I had my own thoughts. I never got lost because the story developed fairly slowly, like missing a couple of days on a soap opera. Details for things that never needed them, over-explanation of ideas; these are common in Koontz books.
The kicker is that they are never particularly bad. I enjoyed the story enough and never thought of stopping. Everything was predictable, but I never had expectations that it wouldn't be. I can say that I wasn't a fan of the very end. I never really like it when a thriller devolves into a conclusion brought by external sources.
So, I decided to go ahead and watch the movie, since I had never actually seen it, then compare them.
First off, the movie is pretty bad. The special effects were terrible, which is something that never really bothers me...I'm bothered because they were completely unnecessary.
Also, like any movie adaptation of a book, there were many changes - some seemingly for no reason.
Regina is a 10yo orphan girl with a physical deformity, in the movie - a 15yo Alicia Silverstone. I assume this was an attempt at star power. In the book, the couple has a son that dies, in the movie a daughter. In the book, Vassago has a collection of corpses that he has arranged in such a way to impress hell. In the movie he is building some sort of large metal modern art piece.
I could go on, but all that really matters is if the movie is good. It is not. Except: Jeff Goldblum. I can watch that dude in anything, good or bad.