Born and raised in Sioux country, Katie McCabe, daughter of an Indian trader, finds herself alone and adrift after her family is caught in a battle between the Indians and the soldiers. Black Moon, the fierce Oglala warrior who has vowed to fight to keep the white people from taking his land, rescues Katie and brings her to live in his village. As Black Moon tries to reconcile his hatred of the whites with his desire for the trader's daughter, Katie struggles with an obligation to marry a man she does not love while yearning for the fierce-hearted Black Moon. The love that ignites between these two wild hearts is tested by Katie's promise to a dying woman, the treachery of a jealous adversary, Katie's abduction by the Crows, the cavalry lieutenant who falls in love with her, and the tensions that erupt between the Sioux and the U.S. Army. From the desolation of the Great Plains to the opulence of St. Louis, a headstrong white girl and a proud Oglala warrior fight for their love and for the wild country of their birth.