PG | | Crime, Mystery, Thriller
A musician is stalked and blackmailed by an unknown killer for the accidental killing of another stalker.
Argento's usual collaborator Ennio Morricone scored the film but had a major argument with Argento over some tracks Argento didn't want in the film. As a result, the director and Morricone would never work together again until 1996, and the rock group Goblin would eventually become Argento's regular composers.
You know, this case is a real challenge. Fortunately, the odds are in our favour.
Roberto Tobias: The odds?
Gianni Arrosio: Exactly. You see before you a fully fledged, highly qualified private investigator with an extensive knowledge of modern science at his very fingertips. And, ...
You have just seen Four Flies on Grey Velvet.