Harry Potter and the Order of the Phoenix (5)

Harry Potter is spending a lonely summer with the Dursleys when he and his cousin Dudley are suddenly attacked by Dementors. Harry manages to drive them away with great difficulty, but because he has used magic in front of a Muggle, he is threatened with expulsion from school. But that's only the beginning of the trouble, because back at Hogwarts, hardly anyone believes that Voldemort is back. And then there's the new teacher, who seems to be trying to prevent the students from learning magic.