Swift, a young wolf cub, lives with his pack in the mountains learning to hunt, competing with his brothers and sisters for hierarchy, and watching over a new litter of cubs. Then a rival pack attacks, and Swift and his family scatter.

Alone and scared, Swift must flee and find a new home. His journey takes him a remarkable one thousand miles across the Pacific Northwest. The trip is full of peril, and Swift encounters forest fires, hunters, highways, and hunger before he finds his new home.