From #1 New York Times bestselling author Patricia C. Wrede, the fantastic conclusion to her tale of magic on the western frontier.Eff is an unlucky thirteenth child...but also the seventh daughter in her family. Her twin brother, Lan, is a powerful double seventh son. Her life at the edge of the Great Barrier Spell is different from anyone else's that she knows.When the government forms an expedition to map the Far West, Eff has the opportunity...