Harry Potter and the Dark Healer Year Two

Harry and his best friend, Sadie McIntyre, the Dark Healer, are beginning their second year at Hogwarts. There they are reunited with Draco, Pansy, Tracy and their other friends in Slytherin House, and the gang have more wild adventures in store. Why is Harry hearing sinister voices that no one else can, and who is the mysterious Heir of Slytherin? Will Harry and Sadie find out?