Spring, 1850. After a brutally long winter in the Rockies, Mack Harrigan and his growing family have learned to manage the harsh realities of frontier life. Their new friends, the Shoshone, have taught them the skills they need to survive in this rugged land, from tracking and hunting to fishing and foraging. But when their camp is attacked by an enemy tribe, the skills the Harrigans need most are those of a Shoshone warrior.