The discovery of two bodies in Parque do Estado reveals the presence of a serial killer in São Paulo.

As more bodies are found, the suspect, Francisco de Assis Pereira, flees to South America; his photo is released, survivors identify him and past unsolved cases emerge; Francisco claims innocence, but weak evidence complicates the investigation.

After confessing to the crimes, Francisco leads the police to another victim; Brazil is stunned by the media exploitation of the case, which discredits the survivors and turns Francisco into a sub-celebrity.

Francisco's trial debates his mental state; diagnosed with antisocial disorder and psychopathy, he's sentenced to 285 years but will serve a max of 30 due to Brazilian law; unreleased audio exposes his criminal mind, leaving justice uncertain.