Regina es una señora mayor que vive sola en Copacabana. Una noche cree ver un asesinato en el edificio del otro lado de la calle, y lo informa a la policía, pero al ver que no le hacen caso, decide investigarlo ella misma.
Regina, a lonely 65 year old woman who works in the neighborhood watches for the police in Copacabana.She 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.