What Ever Happened to Baby Jane? is a classic black and white film starring Joan Crawford and Bette Davis. It is truly frightening in a psychological way. I had no idea the movie was based on a book!
I discovered that while watching Feud last year.
I eventually found the book on Amazon. The movie actually follows the book pretty closely. I was impressed by that. I recommend this book whether or not you have seen the movie.
{Disclosure: If you buy the book via my Amazon Associates link, I get a tiny percentage of the price. }