Y'know...
You don't need a last name if somebody only remembers the first name of their favorite author. You have the first name, the genre, and the type of reading material (novel, in this case) that you want.. Put some actual finger-power into it and enter all three into any given internet search engine. I might suggest Amazon.com. Don't complain that people aren't taking enough of the workload to find your own reading material off of your back when they're doing their best to help you out.
As far as novel reccomendations, Stephen King is mind-numbingly predictable, although he's produced one or two gems... not including his non-horror works, which I tend to enjoy (he can write, after all, his books just aren't good for suspense). I found the movies based upon his books slightly better for suspense, to be honest, mostly because for all my love of reading I'm a slave to the pre-visualized. Try Straub. Then again, are you actually looking for "horror," or just for anything with werewolves or vampires in it? If it's the latter, and you haven't already read everything by Anne Rice, try Anne Rice.
Here's a thought... either way. Lovecraft. He only wrote short stories but they've been compiled into novels. He based a lot of his works on ancient cults and religions. They're the only books I've ever read that I actually found scary, although it takes some depth and intelligence to fully appreciate them (and that little snippet of literary snobbery didn't originate with me, so nyah). Be prepared for a now-somewhat-archaic writing style (similar to Tolkien, of whom Lovecraft was a contemporary).
Lovecraft was a mentally unstable man who died relatively young. There's a good bit of (albeit circumstancial) evidence that he and his mother had an incestuous relationship, begun by her but longed for by him after she died. Some of his fans like to say he died from a broken heart, but as I recall it was a combination of cancer and something else, one of those peculiarly named ailments left over from the nineteenth century and before that doesn't occur all that often anymore. An entire "mythos" has grown up around his writings because he invited other horror authors to use his material in their own works. Most of his material deals with bizarre dimensions of insanity and alien gods, that sort of thing. Now it's the subject of fairly good roleplaying games and really cheesy Sci-Fi channel made-for-TV movies. I reccomend the former if you're into that sort of thing.
I am, but I realize that not everybody has my level of good taste.
Yes, that's sarcastic, although if anyone's read this far and couldn't realize that on their own, I do pity them.