In 1866, the ever-increasing hostilities between the army and the Sioux plant seeds of doubt in Katie's mind as to which world she belongs - the white world  into which she was born, or Black Moon's Lakota world in which she has chosen to live. As tensions intensify on the Great Plains and Black Moon rides with Crazy Horse to rid the Powder River country of the Long Knives, Katie joins a wagon train and embarks on a journey of self-discovery, setting in motion events that change the course of history.