A poor Mexican diver finds a priceless pearl that will change his impoverished family's future -- if he can fend off his own greed and the people trying to take advantage of him.

The killing of a political leader shatters the peace of a small Mexican town. MANCO, the brother of the murdered presidential candidate knows the killer and sets out to exact his revenge. Arriving to investigate the assassination is special agent AMIGO from the Mexican Intelligence. Amigo quickly strikes up a friendship with a local hotel owner who fills him in on the town's seedy characters and gives Amigo a Single Action revolver. The stage is set for Amigo and Manco to join forces and take down the powerful and dangerous CAMARO family responsible for the murder and the corruption of the town. To gain the confidence of Camaro, Amigo breaks his top henchman out of jail. Amigo is welcomed into the Camaro gang. Camaro soon discovers Amigo's connection with Manco and plots to take him out. The situation reaches a boiling point on the US/Mexican border when Amigo, Manco, and Camaro meet for an old-fashioned Western shootout where truth and justice prevail in one single action.

Mother and son let the violent father die, who is charged with being reincarnated as crabs and being punished by his own family. In parallel, the present and future of his son appear to show the succession of life perpetually affected by violence.

In 1815, during the Mexican Independence movement, a group of soldiers fighting for Spain take shelter at a ranch where a group of sisters support the other band, the insurgents who are fighting for freedom.

As part of the conquest of Mexico by the Spaniards, Rodrigo, a Spanish shipwreck falls in love with Tizcuitl, the young and beautiful Aztec daughter of Nezuhual, king of Tlacopan, powerful under the emperor Moctezuma.