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. (Ages 9 and older) --Karin Snelson

J. K. 羅琳（J. K. Rowling, 1965- ），英國女作傢，自小喜歡寫作，當過短時間的教師和秘書。二十四歲那年，她在前往倫敦的火車旅途中萌生瞭創作“哈利·波特”係列小說的念頭。七年後，《哈利·波特與魔法石》問世，之後她陸續創作瞭《哈利·波特與密室》《哈利·波特與阿茲卡班囚徒》《哈利·波特與火焰杯》《哈利-波特與鳳凰社》《哈利·波特與“混血王子”》和《哈利·波特與死亡聖器》，完成瞭該係列的創作，在全球颳起一股股“哈利·波特”颶風，在世界範圍內掀起規模宏大的“哈利·波特”閱讀狂潮。另外，在此期間，她還因為慈善事業而先後完成瞭《神奇動物在哪裏》和《神奇的魁地奇球》這兩部與“哈利·波特”係列相關的圖書，最新完成的作品是《詩翁彼豆故事集》。

J.K.羅琳與她的丈夫及三個孩子生活在愛丁堡，一邊盡享傢庭生活的幸福，一邊文學創作。