In 1870s Wyoming, a fragile peace mission between the US cavalry and the Cheyenne Indians is threatened when a civilian surveyor falls for the chief's daughter and befriends his son, sparking a chain of events that culminates in tragedy and ultimately brings about a tragic misunderstanding. The film tells the true story of this pivotal moment in American history, based on real events but with fictionalized characters and plotlines. Tensions rise as the Cheyenne Indians are forced to leave their land for white settlers seeking gold, leading to a dramatic confrontation that will have far-reaching consequences.