Desperation is terrifying! I had a hard time getting through that one. Scary and all together just really fucked up. I have yet to read its sister novel The Regulators (published under King's alias Richard Bachman.

Dan Simmons is one of the rare writers who is great in more than one genre. Hyperion is fantastic science fiction/fantasy and I highly recommend it and Fall of Hyperion as they are essentially one book. If you like horror, don't miss Summer of Night by Dan Simmons. One of my all time favorite horror novels, up there with The Shining for me.