Antonio Castro, Sinatra, is a fighter of life working in an old cabaret in Barcelona imitating Frank Sinatra, accompanied in his show by Groucho Marx, Marlene Dietrich and Lola Flores. But one day, the sky dresses in gray for him; his wife, who works as a waitress in the same place, decides to leave him.
Juan Jose Moreno Cuenca, alias the Heifer, is 23 years old and tells his story as a criminal offender from 1 Ocaña Toledo. Fatherless, the offender has his childhood and how everything changed when her mother went to prison.
A veteran policeman named Fernando feels a lot of hatred against Ángel because the boy ran him over with a car leaving him lame. Now Fernando accuses the young crook of having participated in a robbery at a gas station in which a murder has occurred. Helped by his friends, Ángel rebuilds the facts that serve him as an alibi, but while he is in pre-trial detention in La Modelo prison (Barcelona) a terrible mutiny will take place.
