Lew's skill with firearms gets him a job as a hunter with a trader heading onto the prairies to barter with the Indians. There he meets young Chuck Morris, and together they take on a Cheyenne attack party. Finding shelter in a Sioux village, they absorb the native culture. Lew comes to know the great Sioux chieftains, becoming blood brothers with Sitting Wolf, while Chuck marries the beautiful maiden Zintcallasappa. After Lew plays a decisive role in a battle between the Sioux and Pawnee, he returns to find that Chuck has deserted his wife and son. His attempts to reconcile them culminate in great danger and ultimately, a threat to his life.