Redemption For All

After the war, many students return to Hogwarts to try and pick up where they left off. No one is the same, and there are still enemies hidden. Draco Malfoy has no idea what he believes in, and is only certain that no one believes in him. Blaise is suddenly Slytherin King, the Golden Trio is now a fairly large group-all damaged. Who is it, though, that lurks in the shadows?