Harry Pottter and the Order of the Phoenix

Harry Potter and the Order of the Phoenix by J. K. Rowling, 850 pages

Harry whines quite a bit at the beginning of this, the longest in the Harry Potter saga, but once he settles down he has to deal with the fact that he knows that Lord Voldemort has returned and that few of the people in the wizarding world believe his story. As Delores Umbridge, undersecretary to the Ministry of Magic, attempts to corral power at Hogwarts, Harry, Hermione, Ron, and a group of like-minded students form a group to practice their defense against the dark arts. They call it the DA, short for Dumbledore's Army. Hagrid's relationship with his half-brother, and the interactions between the DA and the Order of the Phoenix (adults who fought against Voldemort last time around) are all interesting. Fred and George Weasley play strong roles in this one, too.