The Potter Twins and The Prisoner of Azkaban

Shortly after their thirteenth birthday, Harry and Chrys Potter are on the run from the Ministry of Magic. Luckily, they make it on to the school year without getting arrested, but Hogwarts isn't any less dangerous. There's a large black dog lurking in corners, and happiness-sucking dementors floating above the castle. Oh, and a serial killer is out to get them. Nothing new.