由赫爾穆特·貝格領銜主演的血蝶上映于1971年，是一部恐怖片類型影視作品，對白語言是其它。講述了　　Duccio Tessari's rare Giallo starring Helmut Berger, Giancarlo Sbragia, Evelyn Stewart, Silvano Tranquilli & Carole Andre. A young student is murdered in a park by an unseen assailant during a heavy thunderstorm. The murderer makes his escape, but is identified by a number of people at the park exit. A sports presenter from a local TV channel, Alessandro Marchi, is quickly arrested, and despite protestations of innocence, is charged with the murder.　　Marchi calls his lawyer, who promises to have him released very soon, but when it comes to the trial the lawyers case is a weak one, full of holes, and Marchi is duly found guilty.　　All is not what it seems and it soon becomes apparent that the lawyer is having an affair with Marchi's wife and obviously does not have Marchi's best interests at heart…