I agree with Eva, I haven't quite come across anyone else up to Louise's calibre. I do have other favourite authors like David Gemmell and Anne McCaffrey, Phillip Pullman and Garth Nix, but I really don't think anything compares. It's gothic and dark fantasy and the characters get genuinely terrified and insane. It gets to the point where you feel the emotion as opposed to just read, absorb, and imagine it, like it's really happened and not just a movie you're seeing in your head or just a story. No one quite punishes their characters with such ruthlessness (and realism, which is amusing to think of in a fantasy) the way Louise does. And she's not afraid of unhappy endings or flawed characters. You can never predict who is going to survive or who is going to go mad. It just feels more real than anyone else's writing.