HARRY POTTER and the order of the poenix by J.K. Rowling

Harry returns to Hogwarts to find that few believe his warnings about Voldemort’s return. He forms Dumbledore’s Army to teach students defensive magic. Meanwhile, the Ministry of Magic interferes at Hogwarts through the cruel Professor Umbridge. The book climaxes with a battle at the Department of Mysteries, where Harry learns a shocking prophecy and suffers a heartbreaking loss.