After a prison riot, a former BOPE captain becomes the head of security in a Rio de Janeiro prison. He tries to clean up the corrupt system while dealing with powerful drug lords and political corruption.

In 1997 Rio de Janeiro, Captain Nascimento is tasked with finding a replacement while taking on drug dealers and criminals before the Pope's visit. As he navigates the corrupt police force and the dangerous slums of Rio de Janeiro, Nascimento must confront his own guilt and protect his family. Neto and Matias, two honest and disillusioned police officers, join Nascimento as he leads a mission to clean up the city. The operation becomes a test of strength and loyalty as they face violence, corruption, and the choice between justice and revenge.