Joe Striker and Will Fawcett constantly face danger and trouble. Evading gunfights and corruption they cross the border into Arizona, where they are joined by Emer Sparrow. However, there can be no safe haven whilst each has a price on their head. So they turn south to Mexico and go separate ways to frustrate the bounty hunters and Arizona Rangers. But Ralph Finn, Muletown's crooked sheriff, has a score to settle. When the chase ends, it's not only their lives that are at stake.