This story is classic Dean Koontz: normal and likable folks in over-the-top bizarre situations. In this book, it's a woman who is in the process of divorcing her abusive, controlling husband when he dies. She should feel relieved to be rid of him, but she seems afraid he will come back. Impossible, right? But this is Koontz...
It's a fun an exciting read, assuming you can willingly suspend disbelief.
I also read recently by this author: The Whispering Room