Albus Severus Potter and the Nightfire Cult

Albus is off to Hogwarts! He expects to have a normal year, but the Potters can't stay out of danger. When a student is attacked, Albus is dragged into the Slytherin world of danger and deception, with his own head of house under suspicion of murder...and Albus begins to discover that not all is as it seems with his fellow Slytherins, his head of house - and himself.