Eternamente Pagu is a biographical film about Patrícia Galvão, best known as Pagu, a Brazilian political, literary and artistic activist. An important figure of the Brazilian Modernism, Pagu was also a militant for the Brazilian Communist Party after she married writer Oswald de Andrade. She broke up with Andrade and, as a journalist was arrested by the Dictatorship of Getúlio Vargas. After she left prison, she abandoned Communism in favor of Trotskyist Socialism, married Geraldo Ferraz, and started a career as theatre director.
When Daniela, a famous actress, decides to return to her hometown to reconnect with a simpler lifestyle, local politicians decide to exploit her influence in order to get ambiguous deeds done.
During an orgy of millionaires, a woman is mysteriously kidnapped and killed. The crime causes quite a stir in local society, as the investigations points to a very known addicted playboy. Although it's never said, the film is vaguely based on a real case happened in 1975, when socialite Ângela Diniz was killed by her lover Doca Street, in Búzios, Brazil.