Book Obsessions

Ever had a book that you just can't get enough of...that you read and read and then immediately want another just like it? Well, I've got one I'm reading now that I can't put down. I wasn't really into the whole paranormal romance thing when it started. I've never read the Twilight books. But I decided to try these books by Maggie Stiefvater and they're about a girl who falls in love with a boy who's a werewolf. The first one is Shiver, I'm on Linger now, and I'm getting ready to put the third one, Forever on hold. So, my question to all of you is: What's your book obsession? What book did you hate to end? Share what you love and maybe someone else's comment will help you find a new book obsession.