All is not well in the streets of Rio de Janeiro. After the BOPE (Military Police of Rio de Janeiro State) violently squelches an inmate uprising at the Bangu 1 penitentiary, lieutenant colonel Roberto Nascimento (Wagner Moura) is promoted to sub-secretary of Intelligence at the public safety department. He has his work cut out for him, as drug cartels have turned the city’s slums into a warzone. He also has sworn enemy in History teacher and staunch liberal Diogo Fraga (Irandhir Santos), who witnessed the BOPE’s violent methods at Bangu 1 firsthand. Incensed, Fraga becomes a state representative Hell bent on exposing corruption in city government. He also marries Nacismento’s ex-wife Rosane (Maria Ribeiro), becoming stepfather to their son.