I'd like to add The Green mile to the hat! It's not strictly a horror but more of a journey, it does have some slightly scary parts but overall it's a fantastic story! You might have seen the movie version of it with Tom Hanks (Great movie also, but read the book first!)
I wrote a list of what i consider to be the
best Stephen King books, and if you read through I do mention a couple of books that aren't specifically "horror". However, you should consider some that fall into the "horror" category too, sure there might be some unsettling moments but the stories are so wonderful it is worth it! Case in point is Different Seasons, which is four stories in one book. One of them is Shawshank Redemption and it's actually better than the movie too. And please comment on my list if it is helpful to you.
King forever
