Roberto, a drummer in a rock band, keeps receiving weird phone calls and being followed by a mysterious man. One night he manages to catch up with his persecutor and tries to get him to talk but in the ensuing struggle he accidentally stabs him. He runs away, but he understands his troubles have just begun when the following day he receives an envelope with photos of him killing the man. Someone is killing all his friends and trying to frame him for the murders.

Directed by: Dario Argento
Written by: Dario Argento
Release date: 1971-12-17
Runtime: 104 minutes
Critics score:
Tagline: When the flies start to crawl, so will your flesh...
Related titles:
Cast:
Michael Brandon Michael Brandon
Roberto Tobias 
Mimsy Farmer Mimsy Farmer
Nina Tobias 
Jean-Pierre Marielle Jean-Pierre Marielle
Gianni Arrosio 
Aldo Bufi Landi Aldo Bufi Landi
Pathologist 
Calisto Calisti Calisto Calisti
Carlo Marosi 
Marisa Fabbri Marisa Fabbri
Amelia, the Maid 
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Also known as:
  • Four Flies on Grey Velvet
  • Négy légy a szürke bársonyon
  • Vier Fliegen auf grauem Samt
  • Cuatro moscas de terciopelo gris
  • Quatro Moscas Sobre Veludo Cinza
  • Четири мухи върху сиво кадифе
  • Fire fluer
  • Neljä kärpästä harmaalla sametilla
  • Τέσσερις Μύγες σε Πράσινο Βελούδο
  • 4匹の蝿
  • Het mysterie van de 4 vliegen
  • Fire fluer på grå fløyel
  • Cztery muchy na szarym aksamicie
  • Den djävulska fällan
  • Fyra flugor på grått sammet