Harry Potter and the Prisoner of Azkaban ending / spoiler
Harry learns that Peter Pettigrew was the real Secret-Keeper and that Sirius Black was framed. Scabbers is actually Pettigrew in Animagus form. Harry and Hermione help Black to escape just as he's about to be given the Dementor's Kiss. Lupin is a werewolf and resigns as Defense Against the Dark Arts teacher.
Submitted by skore
