Before setting out for the Comanche grasslands with a herd of horses to trade, Tukor receives the medallion from his grandmother. Double crossed by the Comanche chief Crooked Horn, Tukor escapes death only by the intervention of the ancient piece of silver. Returning home with a strange slave he rescued, Tukor sets out to find the Great Water in the northwest that his great grandmother Lita sought more than 100 years before.