哈利·波特在霍格沃茨魔法学校已经度过了不平凡的两年，而且早已听说魔法世界中有一座守备森严的阿兹卡班监狱，里面关押着一个臭名昭著的囚徒，名字叫小天狼星布莱克。传言布莱克是“黑魔法”高手伏地魔——杀害哈利父母的凶手——的忠实信徒，曾经用一句魔咒接连结束了十三条性命。不幸的是，布莱克逃出了阿兹卡班，一心追寻哈利。布莱克在睡梦中仍然呓语不休：“他在霍格沃茨……他在霍格沃茨。”

哈利·波特虽然身在魔法学校的城堡内，既有朋友的赤诚帮助，也有老师的悉心呵护，但校园内危机四伏，哈利的生命时时受到威胁。一天，布莱克终于站到了哈利的面前……

Harry Potter, along with his best friends, Ron and Hermione, is about to start his third year at Hogwarts School of Witchcraft and Wizardry. Harry can't wait to get back to school after the summer holidays (who wouldn't if they lived with the horrible Dursleys?). But when Harry gets to Hogwarts, the atmosphere is tense. There's an escaped mass murderer on the loose, and the sinister prison guards of Azkaban have been called in to guard the school ...