Harry Potter grew up with his horrid aunt and uncle thinking he was a normal boy. This all changed when a letter came for him, informing him he had been admitted to Hogwarts School of Which craft and Wizardry. Suddenly Harry is thrust into a world of monsters, magic and danger, where he learns the truth of his parents death, and just how he got his mysterious lightning scar.
In this, the third of the Harry Potter series, Sirius Black, servant of the dark lord and Harry's dads old childhood friend, has escaped from Azkaban and is supposedly after Harry. Harry and his friends must deal with homework, drama, time travel, and possibly death, perhaps learning a bit more about Harry's parents on the way.
This story has such twists and turns that, even if you've read it before, you're flipping through the pages late into the night. Harry and the others really start to develop as characters in this book, and some of the history behind Harry's parent's death if revealed I guess for some it might be a little confusing because there is so much going on, but as long as you keep your head on your shoulders and your wand in your hand, you'll be fine.