The Aztec uprising in 1810 left young Juan Martez orphaned in a savage land. His life is spared when a Spanish gunmaker learns of his skills with gunpowder and buys him to make munitions. Keeping his Aztec heritage low key, Juan becomes a fine gunmaker. But his talent is kept secret so he can remain alive. Juan secretly works the Mexican underground, running guns and black powder to guerrilla forces fighting for independence. His destiny is to lead the Mexico against Spanish rule. With his skills, a battle is ignited and revolution begins.