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...《灰天鹅绒上的四只苍蝇》是达里奥·阿基多于1971 年在其它 导演，由迈克尔·布兰登,梅茜·珐玛,让-皮埃尔·马里埃尔,弗朗辛·拉塞特等出演,剧中使用其它对白,是一部恐怖片电影。