Sergeant Carlos Olivarez of the Mexican Rurales (police) suspects a North American named Clark of complicity in a land swindle. He believes the woman Consuela to be in league with Clark, and further believes her responsible for the seduction and betrayal of Carlos's brother Juan, who commits suicide. Carlos befriends young Ramon Ruiz and his family, but discovers that Ruiz's intended bride is none other than Consuela. Carlos sets out to disrupt the duping of Ramon's family by Consuela, Clark, and their vicious henchman Pedro.
South of the Rio Grande
After being duped by Consuello into losing the family fortune, Carlos' brother Juan commits suicide. When Carlos next meets Consuello, she is the bride to be of his friend Ramon and this means more trouble.
