While being taken to La Quebrada prison, Gladys Guerra "La Borges" and other inmates with no prison experience are attacked. The vehicle transporting them sinks into the river, and the prisoners, abandoned to their fate, face certain death. However, Gladys frees herself and the others. Minutes later, five survivors reach the shore, covered in mud. United by adversity, this group of women will face the hostility of the prison regime and the challenges posed by the different "tribes" that manage the daily life of the prison.