A retired woman spends her days snooping everybody in her neighborhood as a police informant. When she thinks she sees a man murder a woman, but the death is seen as natural by the police, she decides to prove she was right.

Regina, a lonely 65 year old who works on the neighborhood watch for the police in Copacabana, believes to have witnessed a murder in the building across the street, and ends up getting involved with the suspect in a potentially dangerous chain of events that will force her to take stock of her life.—Marcos Bernstein