Harry Potter, the Valerian, and the Prisoner of Azkaban

Though the Valerians have now reunited, for the most part, they are quickly divided as Sirius Black escapes Azkaban, supposedly to avenge Voldemort's defeat at the hands of Harry Potter. With half believing in his guilt and half believing his innocence, there might be civil war before the year is up. And on top of all that, there are more than just new faces at Hogwarts...