A Dario Argento horror along the lines of 'Phantom of the Opera'. Betty (Christina Marsillach), a young understudy at the opera house, finds herself in demand when the female lead in Verdi's Macbeth falls ill. Whilst on stage, her fears about the curse of Macbeth begin to ring true as a stagehand is murdered and several ravens used in the production are killed. Betty is then taken captive by th...