Harry Potter finds himself in another tough situation with his relatives and uses magic to deal with their mistreatment. Fleeing after accidentally inflating his Uncle Vernon’s sister, Harry initially fears punishment for using magic outside of school. However, he discovers he won’t be penalized. His relief is short-lived as he learns that Sirius Black, a dangerous criminal and Voldemort’s ally, has escaped from Azkaban with plans to kill him. To make matters worse, Dementors, sinister creatures, are stationed at Hogwarts and have a devastating impact on Harry. As tensions rise and danger looms, Harry must confront his fears and uncover the truth about Sirius Black’s intentions.