Obviously, all of the Harry Potter books are amazing for different reasons, but Prisoner of Azkaban is definitely the best.
Lucy Knisley. Harry Potter and the Prisoner of Azkaban
How cute is Hermione in this deleted scene from The prisoner of Azkaban
Harry Potter & The Prisoner of Azkaban by Florey, via Behance
Harry Potter and The Prisoner of Azkaban - 2004 haha from the angle of the pic it looks like rons wearing a slytherin tie
Harry Potter and the Prisoner of Azkaban | inside the Shrieking Shack
Gary OLDMAN (b. 1958)  Notable Films Part 3, Photo: as Sirius Black in 'Harry Potter and the Prisoner of Azkaban'
I personally identify with Ron all the time, but the tap-dancing spiders dream really hits home for me.
Harry Potter and the Prisoner of Azkaban by PigandPepperArts