George Benton returns from school to his brother Jonathan's farm as a doctor and marries his fiancé Lory, but happiness doesn't last long. The Fargas brothers provide a bloodbath at the ranch and are able to divert suspicion from themselves onto a gang of passing outlaws, but one of the family has survived the massacre and knows who the actual killers are.
Romolo, a man lazy and devoid of any interest, has been married for ten years with Ines, the owner of a small service station. Tired of supporting his despotic and demanding wife, Romolo searches for a way out and finds it when Orazio, a former fellow soldier, who lives by his wits, invites him to roam freely with him around the world.
An island has been decimated by a volcanic eruption and the few survivors escape to a nearby island. Led by Rutolo, they know that their new home is equally susceptible to such a catastrophe via its own volcano, but they are unable to convince the current inhabitants of Island #2 to flee with them to a mainland.