Harry Potter and the Prisoner of Azkaban follows thirteen-year-old Harry during his third year at Hogwarts School of Witchcraft and Wizardry, where he learns that the escaped prisoner Sirius Black is supposedly hunting him down. As Harry navigates new classes, mysterious creatures called Dementors, and shocking revelations about his parents' past, he discovers that the truth is far more complex than anyone imagined. With the help of his friends Ron and Hermione, Harry uncovers secrets about loyalty, betrayal, and the power of choosing mercy over revenge.