"Mischief Managed." 
 The Harry Potter series grows with its characters. The older they get, the darker and more mature the story becomes. The Prisoner of Azkaban is the book where it all starts to get more serious. We delve deeper into the past, we learn more about the Potters' death and the impact it had on the people around them. 
 The first two books were fun for sure, but PoA has a lot more to offer than just Harry's reckless adventures. It deals with friendship, grief and loss. For me, the main hero of this book isn't Harry, but Lupin. It's his heartbreaking story that gets me everytime. I especially love the contradiction between him and Snape. They've both suffered, they've both felt lonelier and more helpless than any person should feel. But where misery and loneliness softened one,they hardened the other. Lupin chose to become kinder and more compassionate in the face of tragedy; Snape grew bitter and cold. They are so fundamentally different, but I still love them both. Both are brave and strong, in their own completely different way. Oh, my heart is going to break in the seventh book. 
 Also, Hermione is a total badass in this one. I admire her courage to stand up for what she believes, even though her friends might hold it against her. And she is always caring, trying to help everyone around her. She is an insufferable know-it- all, Snape was right, but, well, truth be told, she is quite brilliant. 
 All in all, I'm going to quote the Doctor on this one;