Harry Potter returns to Hogwarts in search of Rowena Ravenclaw's diadem and in preparation for the final battle against Lord Voldemort. However, he finds more than he bargained for in the workings of Slytherin House and in the heard of a young Ravenclaw.

The Battle of Hogwarts was the largest frontal battle in the Second Wizarding War but it was small compared to the forces which might have been mustered on either side. What if both sides had managed to rally more effectively?