Harry Potter and the Prisoner of Azkaban by J.K.Rowling
In Harry Potter and the Prisoner of Azkaban by J.K. Rowling, Harry, Ron, and Hermione go to Hogwarts for their 3rd year. In this book, the third in Rowling's absolutely amazing series, we learn more secrets about Harry's adventures.
People believe there was a break out in the wizarding prison Azkaban! The person who broke out is known by the name Sirius Black! Azkaban is guarded by horrible creatures called dementors, and they're guarding Hogwarts! Also, 3rd years have permission slips that have to be signed by parents or guardians to go to a fun place called Hogsmeade. Harry didn't get his signed, because his guardians refused. Harry was determined to find a way to not miss out on the fun. And then a great adventure began!
I really like this book, and the whole series. I read these books all the time, and I think everyone will love the next ones, too.