这是一个不同寻常的学期，魔法学校的盛事：三强争霸赛在霍格沃茨举行。学生们争先报名，希翼获得永恒无上的荣誉。火焰杯在选出三所学校的三名勇士后，竟将未足年龄的哈利也挑选出来。
哈利（Daniel Radcliffe饰）的当选引起其他学生的嫉妒连连，就连铁哥们罗恩（Rupert Grint饰）也首次和他闹起了别扭，哈利感到孤立无援，还好有教父小天狼星和赫敏一直支持他。可总有些好事者如记者丽塔等着看他的好戏。天知道这场比赛是何等艰辛危险，在龙的眼皮下偷蛋，潜入湖底救人，在迷宫中探险……一不小心，甚至可能付出生命的代价。
黑魔王伏地魔的威胁渐渐显现，每一天都险象环生，动人心弦。

Harry Potter has to sneak back to Hogwarts, after accidentally inflating his horrible Aunt Petunia. But once there everyone is whispering about a prizoner who has escaped from the famous wizard prizon, Azkaban. His name is Sirius Black, and as a follower of Lord Voldemort he is determined to track Harry Potter down - even if it means laying siege to the very walls of Hogwarts!

In one of the most hotly anticipated sequels in memory, J.K. Rowling takes up where she left with Harry s second year at the Hogwarts School of Witchcraft and Wizardry. Old friends and new torments abound, including a spirit named Moaning Myrtle who haunts the girl s bathroom, an outrageously conceited professor, Gilderoy Lockheart, and a mysterious force that turns Hogwarts students to stone.

Harry Potter has never played a sport while flying on a broomstick. He's never worn a Cloak of Invisibility, befriended a giant, or helped hatch a dragon. All Harry knows is a miserable life with the Dursleys, his horrible aunt and uncle, and their abominable son, Dudley. Harry's room is a tiny cupboard under the stairs, and he hasn't had a birthday party in ten years.
But all that is about to change when a mysterious letter arrives by owl messenger: a letter with an invitation to a wonderful place he never dreamed existed. There he finds not only friends, aerial sports, and magic around every corner, but a great destiny that's been waiting for him... if Harry can survive the encounter.

哈利波特（丹尼尔•雷德克里夫 Daniel Radcliffe 饰）结束了假期，即将回到霍格沃兹继续学习魔法。一个叫多比的家养小精灵警告哈利不要回到霍格沃兹，否则会陷入极大的危险。哈利没有听从多比的劝告，回到了霍格沃兹。很快，霍格沃兹发生了一连窜怪事:接二连三出现学生被石化，一直找不出原因。而哈利总能听到一种奇怪的声音，从墙壁里传出来。
传说，霍格沃兹有一个密室，里面记录着伏地魔年轻时的秘密，只有斯莱特林的人才能打开密室。哈利偶然发现自己能听懂蛇说话，一时传闻是哈利打开了密室。难道多比所指的危险就隐藏在密室？