A list of the best horror books of the last 20 years has been released, but there is some uncertainty about which book has been ranked as the best. Some outlets suggest a manga series has been crowned the top horror book, while another outlet reports that Shirley Jackson's "The Haunting of Hill House" has been named the best written horror novel, despite being published over 60 years ago. The list appears to include a range of horror books, including post-apocalyptic novels and thrillers.