Draco shackled to a pillar. Harry wielding a sword. One goofy plot device. You do the math.

Back at school to complete his education, Harry doesn't like life to be boring, that's why he teams up with Draco Malfoy for his final year DADA project.

Bits of Hogwarts seem to be failing and a magical circle has appeared in the Great Hall. Harry and Draco end up in the middle of finding out what it's for.

After Lucius goes to Azkaban, Draco takes over as Lord Malfoy and learns that the family's success is based on a secret means of spying on their enemies. Knowledge is power - but when Draco learns the truth about Harry Potter, his father's strategies look a little less brilliant than he'd assumed. Text version here: http://www.hpfandom.net/eff/viewstory.php?sid=24885