There is no one definitive answer to this question, as what may be considered scary to one person may not be so to another. However, many people who have read the book Haunting of Hill House do report feeling scared while reading it. The book is written in such a way that it creates a feeling of suspense and unease, and the reader is never quite sure what is going to happen next. If you are looking for a book that will give you a good scare, then Haunting of Hill House may be just the one for you.
