Ceferino, a young Asturian, says goodbye to his parents and his girlfriend to emigrate to Mexico to make the Americas. There he works with an uncle of his who owns a grocery store. Under his tutelage, he quickly learns the tricks of the business: a kilo has to weigh nine hundred grams. He thus earns the scorn of his aunt and his cousin, who threw him out of the business after the death of his uncle. He then he will be forced to survive by selling books all over the country.