The listing, Thirteenth Child by Patricia C. Wrede has ended.
Used book. Great condition. A little wear on the cover. Eff was born a thirteenth child. Her twin brother, Lan, is the seventh son of a seventh son. This means he's supposed to possess amazing talent-and she's supposed to bring doom to everyone around her. Her father is a professor of magic at a school perilously close to the magical divide that protects settlers from the beasts of the wilderness.......