The Tatu Tatuado de Topázio ring, by socialite Gracinha de Medeiros, is on display at a museum. She then hires the clumsy security guards Pedrão and Jorginho to watch over the jewel, a family heirloom. The ring is stolen and the pair accused of theft. To prove that they are innocent, they will have to face Portuguese mobsters and a gang of ninjas.