Diego de la Vega is a man caught between two societies: he inherits his aristocratic background from his Spanish father, a high-ranking military officer who has become a landowner. His mother, however was a Shosone Indian, and it is from his Indian grandmother that he absorbs Indian ways, while achieving the unparalleled swordsmanship skills of his father. As his country suffers under the yoke of Napoleon's autocratic rule, Diego becomes a member of la Justicia, an underground movement dedicated to the overthrow of the tyrant. He then finds himself called upon to use his warrior skills to deliver those around him--and to confront a deadly rival.