3탄 《Harry Potter and the Prisoner of Azkaban》

여느 때처럼 괴로운 여름방학을 보내던 해리는 심한 모욕을 받고 화가 난 나머지, 더즐리 이모부의 여동생에게 무단으로 마법을 건다. 집을 뛰쳐나온 해리는 퇴학당할지도 모른다는 생각에 상심하지만, 그를 기다리는 건 더 큰 문제다. 바로 12년 동안 아즈카반이라는 마법사 감옥에 수감되어 있던 악명 높은 살인자, 시리우스 블랙이 탈옥해 해리를 노린다는 소식이다. 론네 식구들에게 보호받으며 방학을 보낸 해리가 호그와트로 돌아가자, 시리우스 블랙이 침입한 흔적이 학교 곳곳에서 발견된다. 그가 부모님을 배신하여 죽음에 이르게 했다는 것을 알게 된 해리는 단짝 친구들과 함께 시리우스 블랙을 찾아나선다.

For most children, summer vacation is something to look forward to. But not for our 13-year-old hero, who's forced to spend his summers with an aunt, uncle, and cousin who detest him. The third book in J.K. Rowling's Harry Potter series catapults into action when the young wizard "accidentally" causes the Dursleys' dreadful visitor Aunt Marge to inflate like a monstrous balloon and drift up to the ceiling. Fearing punishment from Aunt Petunia and Uncle Vernon (and from officials at Hogwarts School of Witchcraft and Wizardry who strictly forbid students to cast spells in the nonmagic world of Muggles), Harry lunges out into the darkness with his heavy trunk and his owl Hedwig.
As it turns out, Harry isn't punished at all for his errant wizardry. Instead he is mysteriously rescued from his Muggle neighborhood and whisked off in a triple-decker, violently purple bus to spend the remaining weeks of summer in a friendly inn called the Leaky Cauldron. What Harry has to face as he begins his third year at Hogwarts explains why the officials let him off easily. It seems that Sirius Black--an escaped convict from the prison of Azkaban--is on the loose. Not only that, but he's after Harry Potter. But why? And why do the Dementors, the guards hired to protect him, chill Harry's very heart when others are unaffected? Once again, Rowling has created a mystery that will have children and adults cheering, not to mention standing in line for her next book. Fortunately, there are four more in the works