Kara Ben-Nemsi, friends and rescuers set out to free a young relative of the guardian of the treasure of the Chaldaeans (Christian sect), who is captured for that fabulous ransom.

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.

Based on the juvenile delinquency of the 1970s and 80s in Spain. Set in Barrio de la Mina in Barcelona, one of the most conflict neighbourhoods in Spain. it follows real juvenile delinquents all with criminal records, used to give the film a realistic touch.

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.