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

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.

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.

In Guanajuato, a piano teacher delays her marriage to an engineer not to let her younger sisters alone. As he is love with her voice, he is mistaken for a sister whom he marries. The teacher then goes to the capital. There she becomes part of a family of young students, who believe she is the mistress of his father, so she suffers the scorn and reproach. Over the years the parents die and she renounces to the inheritance they leave her.

A pregnant and very poor woman has no place to give birth, and turns to a society lady for help.