En farlig fange fra troldmandsfængslet Azkaban er undveget, og faren er så alvorlig, at Ministeriet for Magi ser sig nødsaget til at sende efterretninger til den ikke-magiske verden. Harry er specielt i fare, da fangen åbenbart er ude efter ham.

Udgivet af Gyldendal 

J. K. Rowling
Joanne Rowling (born 31 July 1965), writing under the pen names J. K. Rowling and Robert Galbraith, is a British novelist, philanthropist, film producer, television producer and screenwriter, best known for writing the Harry Potter fantasy series. The books have won multiple awards, and sold more than 500 million copies, becoming the best-selling book series in history. Rowling has lived a "rags to riches" life story, in which she progressed from living on state benefits to being the world's first billionaire author. She lost her billionaire status after giving away much of her earnings to charity, but remains one of the wealthiest people in the world.