In the slum in Morro da Sinuca, a couple of days before turning eighteen year-old, Laranjinha tells his best friend and also orphan Acerola that he misses his unknown father. Acerola decides to help his needy friend to find his father and they discover that he is in prison convicted for killing a man during a robbery and near to be released on parole. Meanwhile, Acerola's wife and babysitter Cris is invited to work in São Paulo and she sees the chance to raise money to buy a house of her own; she tells Acerola that he must take care of their son Clayton alone for one year. When the owner of the hill and Laranjinha's cousin Madrugadão is betrayed by his right-hand Nefasto, he is expelled from the slum and Laranjinha and Acerola have also to leave the hill. While Madrugadão plots a plan to invade and recover the hill with the support of the gang of the drug lord from Morro do Careca, Acerola and Laranjinha unravel the past of their fathers.

In 1997, before the visit of the pope to Rio de Janeiro, Captain Nascimento from BOPE (Special Police Operation Battalion) is assigned to eliminate the risks of the drug dealers in a dangerous slum nearby where the pope intends to be lodged. Captain Nascimento is trying to find a man to replace him because his wife is pregnant and he intends to quit the command and become a trainer of the new recruits. Meanwhile, the two idealistic friends Neto and Matias join the Military Police force expecting to become honest policemen and fight the criminals. However, they see only corruption, lack of competence and stupid bureaucracy in the Military Police, and after a serious incident in the Morro da Babilônia, they decide to join the BOPE. The lives of Capitain Nascimento, Neto and Matias are entwined along the next months, first in the tough training period and then in action against drug dealers...