SIG IS A boy in a coastal tribe, the Storn, long ago in a Northern land. On the day of the wolf hunt, the life of the tribe changes forever, for Sig rescues a small girl, more like the wolves who shelter her than a human. Sig?s family adopts her and names her Mouse, and he becomes a loyal brother to this girl with mysterious powers and a secret past. The shocking discovery of Mouse?s true identity brings to life a terrifying legend and leads to war, betrayal, and Sig?s coming of age as he finds the wit and courage to save his tribe.