The best novel I've ever read has to be Lord Loss by Darren Shan. It's the perfect book for horror lovers - the world-building is excellent, characters intriguing and horrifying, and plot perfectly designed to keep you on your toes. This is one of the few books where I can't see the ending coming. All of Darren Shan's works are amazing, but Lord Loss, the first of the Demonata series, really takes the cake. It's a beautiful intro to a terrifying world of demons and magic, blood and gore, magicians and monsters. All the characters are delicately crafted, before being put through a series of frightening trials to test their abilities. I always thought horror was just cheap and gross, but this book is a whole other level.