In South Sunday, Montana, reporter J.B. Kendall arrives to document frontier life, stirring anxiety in a town under Sheriff Clanton's watch. He uncovers Deputy Farley's criminal past and the brothers' dark history with Billy the Kid. With Lila's help, Kendall exposes their secrets, leading to a tense standoff and a moral reckoning. As he leaves, the town's fragile peace is restored but changed.