When a stagecoach is ambushed by a violent gang of outlaws, it is left to the quiet and unassuming war veteran "Mo" (Letitia Wright) to keep an eye on the captured "Tommy" (Jamie Bell) whilst her colleagues go off in search of a bag of loot that their would-be robbers had already stolen. The wily and ruthless "Tommy" tries all sort of tactics to try and get her to trust him - and to untie him fromver mais...