Roberto (Michael Brandon) is a young handsome drummer playing in a rock band. For the last week he has been stalked by a mysterious guy with dark sunglasses. Roberto decides to put an end to this and follows his stalker in a deserted theatre. He confronts the man and accidentally kills him. At the same time, another mysterious stalker with a weird mask appears and takes pictures of the accidental murder. For Roberto and his girlfriend Mina (Mimsy Farmer) it's the beginning of a nightmare, and more murders will ensue soon. Dario Argento directs. Director Dario Argento Starring Bud Spencer, Mimsy Farmer, Michael Brandon, Jean-Pierre Marielle, Special Features: Full Frame - 1.33 Widescreen - 2.35 Audio: Dolby Digital 1.0 - English, Italian Additional Release Material: Alternate Scenes: English Opening Trailers: 1. Teaser Trailer 2. Original Theatrical Trailer Text/Photo Galleries: Additional Text: Closing Credits Galleries: Extensive Poster/Photo Gallery Runtime: 102 Minutes.