Harry is about to start his third year in Hogwarts and Sirius black a mass murderer and follower of Lord Voldemort is on the run, they say he is coming after Harry. Omens of death are seen everywhere and the school grounds are now guarded by the soul sucking and terrifying Dementors. The third installment in the series, Harry Potter and the Prisoner of Azkaban is an amazing book, the whole story is not what it seems to be, the ending is unexpected, shocking and heartbreaking but good. New characters are introduced and the wizarding world is expanded. Harry learns more about the past of his parents and the magical world. Each book in the series keeps improving upon the last one and in this case it certainly has improved drastically, J.K. Rowling again carefully crafts clues into her writing which we never notice until we read the book again. Overall I give this book a 4.9 out of 5.