In search of Mephisto and his sister, Tex joins Montales, a man leading a rebellion against the corrupt Mexican government. Besides the final showdown with Mephisto, Tex decides to help fight injustice in Mexico and joins the revolution.
This story can also be seen as two separate adventures: in the first, Tex tracks down and captures Mephisto. In the second he stays with Montales, and leads the rioters to victory.
