Harry Potter and the Prisoner of Azkaban is the third book in the Harry Potter series written by J.K. Rowling. In this installment, Harry Potter returns to Hogwarts School, where he and his friends, Ron and Hermione, try to uncover the mysteries related to the dangerous criminal, Sirius Black. The plot is filled with magic, adventures, and unexpected events, keeping the reader constantly on edge. This book is particularly notable for its dark and dramatic tone, which makes it especially captivating.