When the unlucky magical twin Eff joins an expedition to map the Far West, she endures a long prairie winter and encounters with previously unknown creatures before realizing the importance of ending a magical flood.

Eighteen-year-old Eff must finally get over believing she is bad luck and accept that her special training in Aphrikan magic, and being the twin of the seventh son of a seventh son, give her extraordinary power to combat magical creatures that threaten settlements on the western frontier.