In October, because of Halloween, I have a tradition of watching horror movies. This year, I’d like to include some books. Any recommendations?

I'm not from the US, but I love Halloween, so October is really special to me. Every year, I have a tradition of watching horror movies, but this time, I’d like to mix it up by adding some spooky books. I think 3-4 recommendations would be perfect. What are your best picks for horror novels that you would read on Halloween?