A group of prisoners (The 12 Apostles), led by “Popo,” plans to escape from the “Sierra Chica” prison. At the same time, they face off against the group led by Gapo (The Arruina Guachos), vying for control of the penitentiary. Conflicts between the factions and the police begin, and the prison alarms sound. Thus, during a bloody Holy Week, the prison riot begins, ending in one of the most gruesome events in history.