The Dark Horse — Marcus Sedgwick

Sig is a boy in a coastal tribe, the Storn. 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 like a human. Sig's family adopts her and names her Mouse, and Sig becomes a loyal brother to this girl with unusual powers and a secret past. The shocking discovery of Mouse's true identity brings to life a terrifying legend and leads to war and to Sig's coming of age as he struggles to save his tribe.

Told in a deceptively simple voice, The Dark Horse is a riveting story of betrayal and ancient magic.