In the late nineteenth century, the mule driver Juan Moreira is a good gaucho and worker who, like many others, is subjected to abuse and humiliation by the powerful, either the police or landowners.
The story of Santos Vega, an Argentine gaucho from the province of Buenos Aires, who lived around 1830, and who gave rise to a legend in which, being an invincible payador, he ends up falling defeated to none other than the Devil, embodied in the person of Juan Sin Ropa, the only one who could defeat him.