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"The Mirror" by Marlys Millhiser
It´s a story about a bird that creates tons of threads and one day the mirror talks to the bird and tells him, that he will loose a feather for every thread created.....

"I've never read any Poe or Lovecraft ."
Well, that's a good place to start then ;)

I'd also recommend Charles Stross' work, although that mixes in spycraft & science-fiction with the horror, and most of the horror side is very shamelessly drawing on Lovecraft.

Lovecraft is the way to go, I barely read books but hell, his books are great.
At The Mountains Of Madness, mh mh!

House of Leaves by Mark Z. Danielewski
Haunted by Chuck Palahniuk
Lovecraft collection
The Resurrectionist by Wrath James White

Not exactly considered horror, but Dante's Inferno is a must-read if you haven't picked it up yet.

Stephen king is majority of books movies i have read/seen [ IT/ Last Stand my favourites]myself but i found Dante Alighieri's Divine comedy an awesome trip though wouldnt consider it horror i geuss. So have u ever thought about reading horror manga's? If not and maybe interested there are quite some good ones /bad ones freaky ones and ''dirty'' ones'' Varying from serial killers, world disorder, ghosts and some apocalyptic psychological manga's.

If interested have a look at this one its ongoing atm still but just to give u a general idea in how manga's can be a differnt kind of thing worth being to explore http://www.mangago.me/read-manga/00_mhz/bt/245248/Ch0/1/

You said that you have readed enough of Stephen King... but... have you read "It"? D:
Also, you should try:
Ghost Story by Peter Straub.
Hell House by Richard Matheson
House of Leaves by Mark Z. Danielewski
Books of Blood by Clive Barker (Recomended)

Well, those will give you a good time of "fun" D:

Twilight

Clive Baker, Books of Blood vol 1-3, (collection of short histories)
Down, Satan!
The Midnight Meat Train
The Inhuman Condition
The Age of Desire
are some of my favorites
You can find more about it here :
http://en.wikipedia.org/wiki/Books_of_Blood

Try with Otsuichi's Summer, Fireworks and my Corpse or ZOO

Peter Straub - Ghost Story

Fifty Shades of Grey.

Battle Royale

The Hot Zone.

Not a horror per se. But terrifying, and relevant to recent events.

Clive Barker has a new novel about Pinhead.

Goosebump XD

Two classics:

• The Exorcist - William Peter Blatty
• Rosemary's Baby - Ira Levin

Better than the movies XD

I'm not much about horror novels, but I enjoyed "The terror" by Dan Simmons who is a good horror novel writer. He also wrote some Sci-Fi but started with the horror and won some awards about horror novels.

"The novel is a fictionalized account of Captain Sir John Franklin's lost expedition of HMS Erebus and HMS Terror to the Arctic to force the Northwest Passage in 1845–1848. In the novel, while Franklin and his crew are plagued by starvation and scurvy and forced to contend with mutiny and cannibalism, they are stalked across the bleak Arctic landscape by a monster"

http://en.wikipedia.org/wiki/The_Terror_%28novel%29