Harry Potter and the Unexpected Villain

Harry, Hermione, Neville and Luna take on a massive challenge, discover secrets hidden for centuries and spoil Dumbledore's game of chess. What happens if the sorting hat gives away Dumbledore's secrets, what if the dark mark went to a "light" person. *slight Ron bashing* H/Hr rated T for swearing Disclaimer: I don't own Harry Potter. please R&R -complete