Héra, the daughter of Helm Hammerhand, the legendary King of Rohan, must lead the resistance against a deadly enemy. A sudden attack by Wulf, a clever and ruthless Dunlending lord seeking vengeance for the death of his father, forces Helm and his people to make a daring last stand in the ancient stronghold of the Hornburg — a mighty fortress that will later come to be known as Helm’s Deep.