Denizen Hardwick has travelled to Daybreak, the ancestral home of the Order of the Borrowed Dark, to continue his training as a knight. But lessons have barely begun before an unexpected arrival appears with news that throws the fortress into uproar. The Endless King has fallen, his dark realm rising in a brutal civil war. When the conflict strikes closer to home, Denizen and his friends face their greatest challenge yet. For if Daybreak falls, so does the world.