Zane Carter and his sons, eleven-year-old Ty and thirteen-year-old Joseph, venture one hundred miles into the Idaho wilderness with only a knife and the knowledge of their Nez Perce ancestors. Danger awaits at every deadfall and lurks in every snowy shadow as the boys hunt, fish, make weapons, and build shelter, learning to survive, taking only what they need from the land, and leaving no trace.

During their eighteen-day journey, Zane's determination to fulfill a promise to his grandfather, an Indigenous warrior who exemplified the tenets of a wise and spiritual existence, is thwarted by a fatal encounter that transports Zane into an ancient realm as he straddles the thin line between life and death.

He wonders what has become of his boys. Have they learned enough patience, resourcefulness, and courage to complete this rite of passage? Will they make it out of the wildlands alive? Or will the unforgiving forces of the natural world take them too far from home to ever return?