Harry Potter and the Prisoner of Azkaban (Harry Potter, Book 3)

For twelve long years, the dread fortress of Azkaban held an infamous prisoner named Sirius Black. Convicted of killing thirteen people with a single curse, he was said to be the heir apparent to the Dark Lord, Voldemort.

Now he has escaped, leaving only two clues as to where he might be headed: Harry Potter's defeat of You-Know-Who was Black's downfall as well. And the Azkaban guards heard Black muttering in his sleep, "He's at Hogwarts... he's at Hogwarts."

Harry Potter isn't safe, not even within the walls of his magical school, surrounded by his friends. Because on top of it all, there may be a traitor in their midst.

J.K. Rowling is the author of the enduringly popular, era-defining Harry Potter book series, as well as several stand-alone novels for adults and children, and a bestselling crime fiction series written under the pen name Robert Galbraith.

The Harry Potter books have now sold over 600 million copies worldwide, been translated into 85 languages and made into eight blockbuster films. They continue to be discovered and loved by new generations of readers. A new faithful TV adaptation of the Harry Potter books is currently in production, and full-cast editions of the audiobooks are now out.

To accompany the series, J.K. Rowling wrote three short companion volumes for charity: Quidditch Through the Ages, Fantastic Beasts and Where to Find Them and The Tales of Beedle the Bard, in aid of her international children’s charity, Lumos. She also collaborated on the writing of a stage play, Harry Potter and the Cursed Child, which was published as a script book.

Her other books for younger children include The Ickabog and The Christmas Pig, which were published in 2020 and 2021 respectively and have been global bestsellers.

J.K. Rowling also writes novels for adults. The Casual Vacancy was published in 2012 and adapted for television in 2015. Under the pseudonym Robert Galbraith, she is the author of the highly acclaimed ‘Strike’ crime series, featuring private detectives Cormoran Strike and Robin Ellacott.

J.K. Rowling has received many awards and honours for her writing. She also supports a number of humanitarian causes through her charitable trust, Volant and is the founder of the children's charity Lumos.

J.K. Rowling’s Harry Potter and the Prisoner of Azkaban, brought to visual life by the iconic chapter illustrations of Mary GrandPré, marks a pivotal, maturing shift in the beloved wizarding series. The story opens with thirteen-year-old Harry enduring another suffocating summer with the Dursleys, a situation that violently boils over when he accidentally inflates his odious Aunt Marge in a fit of rage. Expecting immediate expulsion from Hogwarts for using underage magic, Harry flees into the dark streets, only to be rescued by the chaotic, triple-decker Knight Bus. Upon arriving at the Leaky Cauldron, he is surprised to find the Minister of Magic waiting for him—not to punish him, but to ensure his safety. Harry soon learns the terrifying reason for this leniency: Sirius Black, a notorious and allegedly deranged mass murderer, has accomplished the impossible by escaping from the wizard prison, Azkaban. According to the wizarding world, Black is the devoted servant of Lord Voldemort who betrayed Harry’s parents, and now, he is supposedly hunting Harry down to finish the dark lord's work.

The journey back to Hogwarts aboard the Hogwarts Express introduces a chilling new element to the magical world: the Dementors. These towering, cloaked guards of Azkaban feed on human happiness, plunging the environment into freezing despair. When the train is unexpectedly boarded by Dementors searching for Black, Harry faints, overwhelmed by the traumatic, buried memory of his mother's murder. He is saved by the newly appointed Defense Against the Dark Arts teacher, Remus Lupin, a shabby but extraordinarily kind wizard who quickly becomes a mentor to Harry. Once at school, the atmosphere is suffocated by the heavy security presence of the Dementors. Determined to defend himself, Harry receives private lessons from Professor Lupin to master the Patronus Charm, an advanced spell that conjures a protective shield of pure positive energy to drive the Dementors away.

Meanwhile, the school year is packed with its own unique mysteries and teenage tensions. Harry’s best friend, Hermione Granger, is taking an impossibly heavy course load, appearing exhausted and seemingly being in multiple classes at once. The trio’s dynamic is further strained by a bitter feud between Ron Weasley and Hermione, sparked by Hermione’s new cat constantly attacking Ron’s aging, sickly pet rat, Scabbers. Despite the restrictions keeping Harry confined to the castle for his safety, Fred and George Weasley gift him a magical artifact that changes everything: the Marauder’s Map. Created years ago by four mysterious figures, the map reveals every secret passage in Hogwarts and tracks the exact movements of everyone within the grounds. Using the map, Harry sneaks into the wizarding village of Hogsmeade, but inadvertently overhears a devastating truth: Sirius Black is Harry’s godfather and the man who supposedly sold James and Lily Potter to Voldemort.

The narrative accelerates toward a breathtaking climax when Ron is dragged by a massive black dog into a hidden tunnel beneath the Whomping Willow. Harry and Hermione desperately follow them, emerging in the decaying, haunted Shrieking Shack. There, the monstrous dog reveals itself to be an Animagus—Sirius Black in his human form. Professor Lupin soon bursts into the room, but instead of attacking Black, he embraces him as a brother. The shocking truth is finally unraveled: Sirius never betrayed the Potters, nor did he murder anyone. The true traitor is Peter Pettigrew, the fourth member of their childhood friend group, who faked his death and framed Sirius. In a brilliant twist, Pettigrew is revealed to have been hiding in plain sight for twelve years as Ron’s rat, Scabbers. Just as the group prepares to turn Pettigrew over to the authorities, the full moon rises. Lupin, who is secretly a werewolf, uncontrollably transforms, throwing the group into chaos and allowing Pettigrew to escape into the night.

In the ensuing panic, Sirius and Harry are cornered by a swarm of Dementors by the Great Lake. As they are about to lose their souls to the Dementor's Kiss, a powerful, stag-shaped Patronus erupts from across the lake, driving the creatures away. Harry awakens in the hospital wing to discover Sirius has been captured and sentenced to a fate-worse-than-death execution. Guided by cryptic instructions from Headmaster Dumbledore, Hermione reveals her secret: a Time-Turner, a magical hourglass she has been using to attend all her classes. She and Harry travel three hours back in time, embarking on a high-stakes mission to rewrite the night's tragic events. They successfully rescue a condemned hippogriff named Buckbeak, and Harry realizes it was he himself who cast the magnificent Patronus by the lake. Riding Buckbeak, they free Sirius from his tower cell, watching as his godfather flies off into the night a wanted, but free, man.

Prisoner of Azkaban is a masterful transition from childhood wonder to adolescent complexity, introducing themes of systemic injustice, the lingering scars of trauma, and the profound importance of chosen family. Because you are someone who deeply values the incredible convenience and immense portability of digital reading, exploring this darker, twist-filled installment on your Kindle or through Google Books is an absolutely perfect way to experience the magic. The digital format allows you to carry your expansive personal library with you wherever you go, and its powerful searchability means you can instantly jump back to cleverly hidden clues about the Marauder's Map or Scabbers's true identity. Plus, you can always easily download a free ebook sample right now, ensuring you get a taste of this unforgettable wizarding adventure before diving into the entire, brilliantly written novel!