This book is about a boy named Harry who goes to a school called Hogwarts School for Wizards and Witches. It is his 3rd year at Hogwarts, and this year, a killer has escaped from Azkaban. His name is Sirius Black, and Harry finds something out and goes on another adventure. To find out what happens, you have to read the book.
I would recommend this book to people who like mysteries and fantasy books.