In a boarding house, a not-so-young provincial student lives a debauched life in Mexico's capital at the expense of the money his rich uncle sends him every month. To justify the expenses that he has incurred for so long, his nephew has been inventing lie after lie, to the point where the uncle believes that his nephew has married and has a wife and child. the nephew trusts that the uncle will never discover the deception, since due to his delicate health he cannot travel. But nobody expected that the uncle would visit them on the way to the United States for a medical check-up ...