Harry Potter and the Prisoner of Azkaban is our third opportunity to learn more about the boy wizard and to read all about his amazing adventures.  Once again, Harry is back at his Aunt & Uncle's house, trying as hard as he can to just to make it through the summer so he can get back to Hogwarts School of Witchcraft and Wizardry.  But a visit from his Aunt Marge pushes him a bit to far and ends up giving them an evening none of them will soon forget. Harry leaves the Dursley's, setting off to Hogwarts on his own. He ends up at The Leaky Cauldron hearing news about a prisoner who has escaped from Azkaban, a wizard prison that was believed to be inescapable. Sirius Black is a dark wizard who was in prison for 12 years for the murder of 13 people and is rumored that he helped Voldemort murder Lily & James Potter. Before he escaped from Azkaban, he was heard mumbling, '...he's at Hogwarts, he's at Hogwarts...' . Back at school, Harry, Ron and Hermione are barely able to get back to their studies before abnormal things start happening. Dementors have been posted all around the school to keep an eye out for Sirius Black but somehow he manages to keep slipping into the school. Why is Sirius after Harry? Will Harry be able to find out before Sirius catches up with him and does him in? Harry, Ron and Hermione set forth to find the answers to these questions and, hopefully, remain alive while doing it.