Zeb must make the hardest choice in his life when attempting to save the life of his friend who has been taken captive by the Indians. Luke realizes that he can not stay with the Simonites after more trouble has erupted and the consequences are horrible when Erika decides to follow him. Meanwhile, back on the farm, the rest of the family finds itself in the midst of an Indian tribal war. And at the same time Captain Grey, now turned bounty hunter, continues to search for Luke.

Kate Macahan's sister, Molly Culhane, joins the family. A Mormon family arrives at the homestead while fleeing religious persecution, but the patriarch soon charms Laura. Zeb mediates between the Army and the angry Sioux after a Russian royalty kills a buffalo on Sioux land. Luke aids a local sheriff and meets his feisty daughter.

Zeb sides with the Sioux after the Russian incident triggers a war - and the clash leads to a great leader's sacrifice. Luke's feelings for Hillary Gant intensify, but when her father learns of Luke's past, he asks Luke to leave. Laura accepts a marriage proposal, while Luke finds himself forced to join a thieving band of ex-Confederates.