First of all, Twilight is not Action, Horror. It's more Action/Thriller/Drama. Secondly, I have not talked to one adult who liked this movie. If your not a teenager, don't see this movie and expect to enjoy it. You won't. I haven't yet read the books, but I have heard that this movie is a disappointment, seeing as how good the books are. So, if you don't wanna chance it, I wouldn't read the books beforehand.