Based on a true story in the American owned Cananea mine. It depicts how the owner profits while the Mexican workers struggle to survive and are exploited for their labour.

Analytical view of one of the least reported conflicts of national cinema: the Cristero movement that developed in the regions of western Mexico between 1926 and 1929, highlighting the inability to be faithful to both the Church and the State.

Subjugated by power, the workers of a mining town organize clandestinely.