As a nod to Halloween, I was thinking about the scariest books I've read and I think the often-underestimated Stephen King comes up pretty high on my list. 'It' absolutely terrified me!
I also really like Ira Levin's novels, and 'Rosemary's Baby' is one I've re-read a couple of times.
Another good book that gave me nightmares is Thomas Harris's 'Silence of the Lambs', although it's not a supernatural story. Chilling, though...
Does anyone have any good recommendations?