Brazil in the early 70s. Miguel, Eloi, Osvaldo and Paolo take part in armed attacks against the military dictatorship. They pay a heavy price with torture and arrest. Today the four friends still see each other. Only Miguel is politically active. On a photograph from a political meeting in Sao Paolo he recognises the policeman who tortured them 25 years ago and who was responsible for the death of Miguel's girlfriend. The policeman has been officially dead for a few years. On one of their fishing trips together, Miguel tells his friends of his discovery. When they hunt down and confront their nemesis they come into conflict with both themselves and each other.

Duda, Tato and Nick are inseparable friends, and call themselves "Os Xeretas" (The Snoopers). One day they find a girl with a strange symbol tattooed on her arm, lost in the city. The mystic Alana says she is, in fact, a time traveller, belonging to the Aleph people, responsible for the gates of time and space. She needs to get hold of a medallion to go home, or else she will die, but the medallion has been stolen. The Xeretas decide to help her. They go after the unscrupulous thief and his assistant, who had stolen it from the Museum of São Paulo. In the process, they discover a network of underground tunnels leading to unexpected places.