<p>John Carshalton, late of the British army, returns to the town of Arabella in Kansas to take up a new job as town sheriff. He quickly earns the respect of the townspeople and enjoys a peaceful life until he gets word of outlaw gangs terrorizing towns along the Kansas-Missouri border. US army intelligence suggests that these are no ordinary gangs, but part of a larger more sinister force, and when John is asked by an army officer to pose as a d...