"Harry Potter and the Prisoner of Azkaban" by J.K. Rowling is the third novel in the Harry Potter series, and it marks a significant shift in tone, introducing darker and more complex themes. Harry returns for his third year at Hogwarts, but the atmosphere is tense due to the escape of Sirius Black, a notorious mass murderer and presumed supporter of Lord Voldemort, from the wizard prison Azkaban. It's believed Black is hunting Harry. The school is guarded by the chilling Dementors, creatures that feed on happiness, and Harry struggles to learn how to defend himself against them. As the mystery of Black's escape unravels, Harry discovers shocking truths about his past, his parents, and the true nature of betrayal and loyalty, leading to a thrilling climax that challenges everything he thought he knew.
