Back at Privet Drive, two dementors attack Harry and Dudley, and Harry uses his Patronus, and Now harry could be expelled from Hogwarts. Harry's Trial is proven not guilty, and Ron, Harry and Hermione are back to Hogwarts, except for Harry, it's diffrent. There are skeletal horses only he can see pulling the carrige, Hagrid is mising, and there is a new Defence Against the Dark Arts Teacher, of whom Harry has bad memories of. Her Name was Delores Umbridge.
With only Ron and Hermione with him, Harry is in a bad mood, and Umbridge is rising her status in Hogwarts. No one else belives Voldemort is back, and Umbridge refuses to belive it. Harry spazes at Umbridge about actual defence, because Umbridge dosen't have them using wwands at all. Just Books. Harry frequently is arguing with Umbridge, and she takes away everything he cares about: getting letters from Sirius, Quidditch, and visits with Hagrid.
Harry finds a way to resist Umbridge, which creating a secret fighting group, to teach his fellow peers to fight back. Its known as the D.A., and Harry teaches everyone spells like Patronuses and Expaliarmus. Between everything, Harry is a nervous wreck, and for the cherry on top, Umbridge busts the D.A., and Dumbledore steps into protect Harry, but makes it so Dumbledore has to flee the school. Harry is then devastated when Sirius -----, and it has to do with ----------, and that means one thing he kills Harry, or Harry kills him.