At night the skimmers fly over the Wall looking for human prey and the people of Weld huddle in their houses, but after his two brothers set out through the magic doors in an attempt to find the Enemy and don't come back, young Rye knows that he must follow and find them.

Rye has defeated the sorcerer Olt, freed the island of Dorne, and rescued one of his brothers, but when he returns to the city of Weld with his three companions, he finds that very little has changed--the skimmer monsters still attack at night and the Warden is behaving very strangely.