After Darren Norton shoots Arthur Hamlin dead during a card game, he goes on the run, leaving behind his girlfriend, Sal the Gal.
A reward is put up for his capture and bounty hunter Gustavus Greeley is soon on his trail.
He catches Norton in the hills and intends to take him back to Serenity by stagecoach to stand trial. But there are several other passengers on the stage and the guard is new to the route.
Greeley soon begins to wonder if one of them plans to help his prisoner escape.
He faces a hard and dangerous journey, with death along the way, before he can bring Norton to justice.