Scariest book? (preferably Stephen king)?

I've heard that 'It', 'salems lot', and 'pet sematary' are the scariest and I have seen the film salems lot which I found quite scary but not nail biting and I want to read a book that gives me the same thrill as the actual film. I've been reading dracula and found that quite a good... show more I've heard that 'It', 'salems lot', and 'pet sematary' are the scariest and I have seen the film salems lot which I found quite scary but not nail biting and I want to read a book that gives me the same thrill as the actual film. I've been reading dracula and found that quite a good horror book but I would like something more frightening.
Any suggestions (preferably by Stephen king but not necessary)
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