The wizarding world is thrown into absolute panic following the unprecedented escape of Sirius Black, a notorious, cold-blooded mass murderer from the impenetrable wizard prison, Azkaban. Rumored to be targeting Harry Potter next, Black's escape forces the Ministry of Magic to station the terrifying, soul-draining Dementors around Hogwarts for protection. As Harry navigates his third year, he deals with the chilling effects of the Dementors and uncovers deep, hidden truths about his late parents' past. With the help of his new Defense Against the Dark Arts teacher, Remus Lupin, Harry learns an advanced defensive charm to face the truths waiting in the shadows.