As Harry Potter returns to Hogwarts for his third year, he learns about Sirius Black, a notorious wizard who has escaped from Azkaban, the wizarding prison. Black is believed to be after Harry, as he is thought to be responsible for betraying Harry’s parents to Lord Voldemort. Throughout the school year, Harry, Ron, and Hermione unravel the mystery surrounding Black’s escape and his connection to Harry’s past.
As they investigate, they learn about the Marauder’s Map, which reveals secret passages within Hogwarts. They also encounter Dementors, dark creatures that guard Azkaban and feed on people’s happiness. Harry’s encounters with the Dementors are particularly troubling, as he hears his mother’s dying screams whenever they draw near.
In the climax of the film, Harry and his friends confront Sirius Black and Peter Pettigrew, who they believe is the real traitor. However, they soon discover that Pettigrew is alive and had been living as Ron’s pet rat, Scabbers, for years. Pettigrew reveals that he was the one who betrayed Harry’s parents to Voldemort, not Sirius Black. Sirius, in fact, is innocent and was falsely accused. Pettigrew escapes, and Sirius is captured by the Dementors.
Harry, unable to stand by while his godfather is unjustly punished, and Sirius escape being locked in Azkaban’s infamous soul-sucking Dementor’s Kiss, mounts a rescue mission. With Hermione’s help, he uses a Time-Turner to travel back in time, allowing them to save Sirius and Buckbeak, a hippogriff sentenced to death for injuring Draco Malfoy.
With the use of the Time-Turner, they are able to save Sirius and Buckbeak, and Harry realizes that he was the one who conjured the Patronus that saved him and Sirius from the Dementors earlier in the film. They return to the present, and Harry watches from afar as he realizes that he was never alone during those terrifying moments—he saw his future self and his father conjure the Patronus to save them.
The film ends with Harry learning that Sirius Black, now a fugitive, has gone into hiding and is grateful for Harry’s efforts to save him. As Harry boards the Hogwarts Express to return home, he knows that his life will never be the same, but he is determined to face whatever challenges lie ahead.
Overall, “Harry Potter and the Prisoner of Azkaban” is a thrilling and emotionally resonant installment in the Harry Potter series, filled with twists, turns, and revelations that keep audiences on the edge of their seats until the very end.