Here is a summary of the story in the third book of the Harry Potter series, Harry Potter and the Prisoner of Azkaban Part 3 Story & Reviews.
The story begins with Harry Potter’s third year at Hogwarts School of Witchcraft and Wizardry. It starts with a bang when Harry accidentally inflates his aunt, Petunia’s, sister, Marge, during a visit to the Dursleys. Fearing punishment from the Ministry of Magic. Harry leaves Privet Drive and is picked up by the Knight Bus, a magical transportation service.
At Hogwarts, Harry learns about Sirius Black. It’s a dangerous wizard and notorious prisoner who has escaped from the wizarding prison, Azkaban. Black is believed to be a follower of Lord Voldemort. It is rumored to be seeking revenge on Harry for the downfall of Voldemort.
Dementors, the terrifying guards of Azkaban, are stationed around Hogwarts to protect against Black. These dark creatures feed on happiness and induce feelings of despair and fear in those they encounter. Harry has recurring encounters with Dementors, and he faints during a Quidditch match due to their presence.
As the year progresses, Harry and his friends Ron and Hermione learn more about Black’s past and his connection to Harry’s parents. They discover that Sirius Black was falsely accused of betraying Harry’s parents. James and Lily, to Voldemort, leading to their deaths. The truth is that it was actually their friend Peter Pettigrew, who had been thought to have been killed by Sirius, who was the true traitor.
Harry also discovers that he can produce a powerful stag Patronus charm. Which is capable of repelling Dementors, under the guidance of Professor Lupin, the new Defense Against the Dark Arts teacher. Lupin, it is revealed, is a werewolf and was a close friend of Harry’s father.
Prisoner of Azkaban
Moreover in the climax of the story, Harry, Ron, and Hermione use a Time-Turner. So it’s a device that allows them to travel back in time, to save the life of Buckbeak, a Hippogriff sentenced to death. They also confront Sirius Black, who turns out to be innocent and a friend of Harry’s parents. It is revealed that Peter Pettigrew, in his Animagus form of a rat, has been disguising himself as Ron’s pet rat, Scabbers.
The story concludes with Harry and Hermione rescuing Sirius from the Dementors, while Lupin confronts Pettigrew. Sirius offers Harry a chance to live with him, but Harry decides to return to the Dursleys, knowing that he still has a role to play in the fight against Voldemort.
The third book delves into themes of friendship, betrayal, and the consequences of one’s actions. It introduces the concept of time travel and provides further insight into the events surrounding Harry’s parents’ deaths. It sets the stage for the ongoing battle against the forces of darkness and sets up future revelations and conflicts in the series.