Bass is sworn in and embarks on his first mission as a U.S. Deputy Marshal. The Underwood gang strikes after Bass is let in on a secret.

After pandemonium erupts at Bywater’s store, Bass is forced to choose between his oath and family. Sally runs into trouble at the carnival, while Bass confronts an old nemesis.

Chaos ensues as a firefight breaks out in Checotah. Bass and Jennie have a painful reunion. Bass has an unsettling realization as the myth of Mister Sundown lives on.

Bass struggles with the weight of the badge like never before. After a deadly mission goes awry, the U.S. Deputy Marshal’s fate is left in the hands of someone else.