I know someone who refuses to read a series until it's finished because he can't stand waiting for the next book to be written. I have the opposite problem in that I read a good book and then hope and hope and hope for a sequel to be written. Currently, I'm on tenterhooks hoping for another book from both Sarwat Chadda and Sage Blackwood.
P.S. Yes, they're technically Children's books, but don't judge me or the books by that, ok? Just read them, they're so worth it. Remember, Harry Potter is technically a Children's book too!