This is the third story in the Harry Potter series, harry is about to enter his third year at Hogwarts, and he is 13 years old. But Harry soon received a very unfriendly message from him that Aunt Marg was coming for a week. He hated this woman. No, the woman was insulting Harry's parents incessantly, so he couldn't bear it anymore and turned her into a humanoid balloon that flew into the air, drifting farther and farther away. Ignoring his uncle's persuasion, Harry packed his bags and left his uncle's house. He walked down the street alone.
He sat down at an intersection, but vaguely saw a black dog across from him, but disappeared in an instant. He was still wondering when the Ministry of Magic's jazz bus came and he got on the bus and came to London. Here he meets his good friends Ron, Hermione and others again. But then he heard a terrible news, Azkaban someone escaped from prison, and this person named Sirius Black, said to be the most heinous, is said to be Voldemort's most powerful helper, and the purpose of this escape is to find Harry Potter.
On the train to Hogwarts, they are searched by Dementors from Azkaban, a terrifying thing that robs them of all happiness and beauty, where Harry and his party meet the new teacher who taught them Defence Against the Dark Arts this year: Professor Lupin. Later, Professor Lupin taught harry the skills to fend off the Dementors.
Harry later learns that Sirius Black is a good friend of Harry's parents and Harry's godfather, because his betrayal led to the death of Harry's parents, Harry is very angry, he wants to take the initiative to find Blake, and question him on the spot. A vicious battle is coming, but is Sirius really a heinous traitor, as rumored to be? No, it's all too simple, and it needs to be dug deeper.