Captain Brad Randall, assigned by George Armstrong Custer to look after Eden Murdoch, a white woman found living in a Cheyenne village destroyed by the Seventh Cavalry, begins to question Custer's actions when Eden steadfastly refuses to speak against her captors, saying instead that she considers the Cheyenne people to be her family.

Seamus Donegan's joy in the birth of his first son is cut short when he is ordered by Lt. General Phil Sheridan to be part of an advance team scouting the area in preparation for a move against the elusive Sioux warrior Crazy Horse.