In Brazil, corruption, trafficking and account settlements are the daily lot of the police. Since the arrival at the head of the intervention forces of Colonel Nascimento, known for his uprightness, order seems to be returning. As he and his men have to intervene in a prison plagued by violent riots, the situation escapes them and kills many detainees. From then on, Nascimento is assigned to a new position, far from all violence in a quiet office: is it a punishment or a new way to fight crime?