Brutal murders take set during the new production of "Marilia De Dirceu" at the Theatro Municipal in Rio De Janeiro. When Cristina Andreatti, daughter of famous Brazilian musician - Gastão Andreatti, takes the lead role replacing La Carlota Alencastro, Cristina falls on the hands of a mysterious man in a half white mask who claim to be Alfredo do Vale, a musician who was killed in a brutal accident years ago. Alfredo needs to prove for Cristina that someone else is been causing terror at the opera, and that "Marilia De Dirceu" was actually written by himself!