It's Harry's fifth year and Voldemort is back. No one believes Harry except for the Order, which has been recently reinstated, and his friends.
Death Eaters are attacking muggles and it is getting out of Hand, but the ministry refuses to believe that "He-Who-Must-Not-Be-Named" is back! The Green family isn't helping things either, their family are double spies and Jade, the youngest is one of the most valued Death Eaters, but she is also a D.A. and OOTP member as is her whole family.
Help Harry get through his fifth year, and start the D.A. without getting caught by Professor Umbridge.