Trelles and Amílcar share a room in a boarding house, the rent of which has not been paid for a long time. Trelles is a waiter in a typical Buenos Aires bar while Amilcar is an amateur bolero singer, who divides his time between sleeping and singing for free in a cabaret.

An unscrupulous doctor carries out all kinds of deceptions to profit from his clinic at the expense of his patients and his exploited employees.