Harry Potter & The Prisoner of Azkaban is about Harry’s 3rd year at Hogwarts. Along with friends Ron and Hermione, Harry investigates the case of Sirius Black, an escaped prisoner from Azkaban, the wizard prison. Sirius Black is believed to be one of Voldemort's allies, and he is the only wizard ever to escape Azkaban, so he is definitely powerful. Harry Potter then overhears that Sirius Black wants to kill him.
This book is full of creeps and chills, like in one part, the train to Hogwarts is stopped because of terrible flying things that can suck out your soul. Because of these soul-suckers, Harry almost dies, but in the end, Harry learns a lot about himself, his parents, and friends (both of his, and his parents’).
But this book is still full of interest. In a memorable moment, Harry Potter flies on a Hippogriff, which is a hybrid between a horse and eagle. In another part, The Prisoner of Azkaban goes from fantasy to sci-fi, because of time travel, where Harry goes back in time to save himself.
With the adventurous and scary parts in perfect balance, this book is a good read, and personally, it is my favorite book in the whole series.