The protective wards are shattering. Harry Potter is missing. Voldemort stands at the gates, poised for absolute victory. In a desperate, final gamble, Minerva McGonagall triggers an ancient blood-seal charter to release Hogwarts' ultimate secret: a volatile, nineteen-year-old student kept in stasis for centuries. Known as the Aegis, she doesn't fight for the Light, she doesn't fear the Dark, and she finds the concept of war hilarious. To save the wizarding world, the Order of the Phoenix must unleash a chaotic wildfire they cannot control—and hope she burns the Dark Lord first.