Don Plascencio has a collection of men he uses like radio stations: in a routine aural examination each man plays a different musical piece instead of the usual heartbeat.
A doctor can predict the death of their patients (Terminal Case), an old man meets a teenager through an ad in the newspaper (Classifieds), two young people are assaulted in the historic center of Mexico City (We're Everywhere), a mechanic confesses that he did not fix the brakes on one of the cars...