On the boarder between Mexico and Texas, Frank Morgan is caught between two warring ranchers, men who speak different languages but share the same stubborn courage - and are both being terrorised by a raider called the Black Scorpion. Texas Rangers are struggling to bring law and order to the chaos. But as the air is split by the sound of gunfire and men and women die, Morgan starts to see a different picture - and even comes face to face with the Black Scorpion himself. Suddenly, amidst deep deceptions, double-crosses and secret liaisons, the last gunfighter has become the next renegade. And in this war, Frank Morgan's worst enemies are wearing their own kind of masks - and killing in plain sight...