In his first film as writer/director, Dario Argento (SUSPIRIA, DEEP RED, TWO EVIL EYES) single-handedly created the giallo genre and instantly emerged as the filmmaker critics worldwide hailed as ‘The Italian Hitchcock’. Tony Musante (TRAFFIC, OZ) and Suzy Kendall (CIRCUS OF FEAR, TORSO) star in this pulse-pounding suspense thriller about an American writer in Rome who witnesses -- and is helpless to stop -- a brutal assault, the cunning vengeance of a maniac, and the heart-stopping horror that lives -- and kills -- deep in the dark.