In Prisoner of Azkaban, J.K. Rowling continues to develop her magical world and characters, with a more mature tone than in the previous books. The book has a more intricate plot, with elements of mystery and suspense. The pacing is fast, with several twists and turns that keep the reader engaged. The magical creatures and concepts introduced in this book, such as the Time-Turner, Dementors, and Patronus Charm, add depth to the world of Harry Potter.