Brian Lumley 
House Of Doors [EPUB ebook] 

Behind every door waits a living nightmare . . . Spencer Gill is a man with problems. The fact that he’s dying, slowly, is only one of them. The castle, up on the slopes of a famous Scottish mountain, is another. For one thing, it doesn’t have any doors – at least, not on the outside. And it’s Gill’s nightmare task to find out what it really is. In fact, this horror-house has many doors. But they’re all on the inside. And sheer bloody terror lives and lurks behind every one of them. The welcome mat is out for Gill. And for you. So come on in. Just don’t slam the door . . .