Heloísa is a criminal lawyer who believes that everyone has the right to defense, no matter how bad the crime committed. Experienced, she has a deep understanding of the complexity of prison and the Brazilian prison system where so many languish, abandoned without proper legal assistance. But when a case shocks the country and Heloísa becomes a lawyer for the alleged murderer, she finds herself in the middle of a situation that involves the leader of the largest criminal faction in the country and mysterious people who want him dead.