A defector from the Cuban military returns to his homeland to rescue his daughter who was left behind.

A young doctor falls in love with a disturbed young woman and apparently becomes involved in the death of her husband. They head for Mexico trying to outrun the law.

The story concerns two agents, one Mexican (PJF) and one American, who are tasked to stop the smuggling of Mexican migrant workers across the border to California. The two agents go undercover, one as a poor migrant.