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.

A man goes on a trip and then returns to his village pretending that everything went well for him.

The discovery of a human torso thrown into a waterway, leads the viewer to observe the work of modern criminology and the task of special agents to track and record the psychopath's mentality through the elucidation of techniques present in the reality of the police investigation.