Billy bumps into a new character called Pat Garrett, who is riding with Jesse and the 7 Rivers Gang. Billy joins them – but law makers are already closing in. They plan to flee to Lincoln County – but not before Billy fulfils one last promise.

On the eve of the Lincoln County War, Jesse and the gang are encouraged by Murphy to ramp up their attacks on those famers, mostly Mexican, who have signed up with Tunstall; it's the last straw for Billy, and he decides to change sides.