 In the summer before his third year at Hogwarts, Harry Potter becomes fed up with his horrible aunt and uncle, and after accidentally inflating his visiting aunt Marge, he runs away. Unfortunately, there s much more danger in the wizarding world than harry thought; convicted mass murderer, Sirius Black, has escaped from the wizarding prison Azkaban. Black is known as Lord Voldemort s most devoted follower, and he s after Harry to avenge Voldemort and finish the job. But not everything is what it seems, and inside of Hogwarts there may just be a traitor...