Rowling J. K. Harry Potter and the Prisoner of Azkaban. Book 3

After a spellcasting disaster of gigantic proportions, Harry Potter runs away from the Dursleys’ house in Little Whinging, boarding the Knight Bus in a state of growing dread. But the Ministry of Magic has bigger problems — they are hunting Sirius Black, a devoted follower of Lord Voldemort and the notorious prisoner who has escaped from Azkaban. Rumor has it that he is after Harry Potter himself, and the Minister of Magic has sent Azkaban’s dementors to patrol the school grounds.

During his third year at Hogwarts, Harry is haunted by dark whispers and deadly omens, while uncovering new truths about his past and coming face to face with one of the Dark Lord’s most loyal servants…