Castilviejo is a Castilian town that has been dying of thirst for years and years. It has a large swamp nearby, but it is like having nothing, since its waters do not reach there. Suddenly, some Americans who claim to be experts in oil prospecting descend on those lands, claiming that there is oil. These plots are the property of Don Zoilo Mendoza who, given the evidence of the treasure contained in its subsoil, puts himself in the hands of Don Fausto, one of the town’s richest people, to decide. Don Fausto’s verdict is this: nothing for the Americans, because what is in Zoilo’s lands is worth more than oil, it is water for Castilviejo. (FILMAFFINITY)