In this 1987 horror film directed by Dario Argento, a young opera singer finds herself at the center of a series of gruesome murders. As the understudy for the lead role in Verdi’s “Macbeth,” she becomes the obsession of a sadistic killer who forces her to witness his crimes. The film is noted for its stylish cinematography and inventive use of camera angles, which heighten the tension and suspense. Starring Cristina Marsillach, Ian Charleson, and Urbano Barberini, the movie is a chilling exploration of fear and obsession. For those interested, it can be viewed for free on 123Movies / Movies123.