As Devin's leg worsens, Sara faces a terrifying choice. Brigham Young makes Bridger an offer. Abish delivers a stark warning to the Shoshone.

Ignoring the danger, Isaac sets out to rescue Sara. Jacob's search for Abish comes to an end. Bridger celebrates before saying good-bye.

At a desolate outpost, Sara and her son Devin forge new connections while searching for a guide to help them navigate treacherous trails further west.

Following a lead, Jacob joins a bounty hunter's search. Brigham Young rides into Fort Bridger. Sara, Devin and Isaac come face-to-face with evil.

Red Feather vows to fight, Jacob acts on his suspicions and Abish receives shocking news. En route to Crooks Springs, the elements intensify.

A frightening encounter takes Sara's party by surprise. A deeply wounded Jacob forms a posse to find Abish. Isaac reconnects with his past.