Harry watches the T.V. sneakily trying to hear news about Hogwarts
After hearing nothing on the news he goes for a walk and finds his cousin Dudley. Not long after they both get attacked by Dementors and Harry has to use magic to save them.
I don't know if I can trust this new teacher.
Harry and his friends form a group called D.A. (Dumbledore's Army) to practice Defense Against the Dark Arts, because their new teacher ,Dolores Umbridge, won't teach them.
Harry had been having visions lately, and his scar was acting up. He had also learned that his cousin Sirius had been captured by Lord Voldemort, so he and his friends set off to save Sirius knowing that there would be a battle ahead.
As the battle gets over with Voldemort flees and Harrys cousin Sirius gets killed leaving Harry devestated. Dumbledore tells Harry to return to the school and speaks with him about his prophecy. It is at this moment when Harry learns his secret weapon to beat Voldemort.