Pacto de Sangue is about Silas Campello, a news reporter who sees an opportunity to get big TV ratings through raw, violent content after he starts to cover the murders and gang wars playing out deep in the Amazon jungle between two rival drug lords.
A masked vigilante appears to attack the impunity that allows politicians and contractors to enrich themselves at the expense of the misery and work of the Brazilian population. The story of the man behind the Awakener's guise involves a personal journey of revenge in which a traumatized agent decides to take the law into his own hands.
The festive atmosphere of the first Sunday after the Carnival is soon disrupted when Penha's son goes missing. Certain that his disappearance can only be the work of the militia commanded by former police officer Quirino, an old dislike, Penha will soon find out the consequences of doing justice with her own hands.