本片是一部意大利悬疑片，上映于1971-12-17，由达里奥·阿基多导演，由Michael Brandon/Mimsy Farmer/Jean·Pierre Marielle主演。
剧情简介：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...
外文名：4 mosche di velluto grigio
别名：Four Flies on Grey Velvet
类型：悬疑 / 惊悚 / 恐怖
地区：意大利 / 法国
导演：达里奥·阿基多
编剧：达里奥·阿基多 / 路易吉·科齐 / Mario Foglietti
演员：Michael Brandon / Mimsy Farmer / Jean·Pierre Marielle / Francine Racette
