Emanuelle's Revenge (Italian title Emanuelle e Françoise le sorelline), also known as Blood Vengeance, Demon Rage and Blood Rage, is a 1975 horror film directed by Joe D'Amato.
It marks something of a watershed film for the director, as he made his first entry into the popular Emanuelle series, and also because he combined sex with extreme violence. The following year he began making the Black Emanuelle series with Laura Gemser.
It was scripted by then unknown director Bruno Mattei, the first of their collaborations.
Francene is abused and degraded by her husband Cardi (played by Italian actor George Eastman), and eventually she kills herself. Her sister Emanuelle then chains Cardi in a soundproof room with a two-way mirror, and tortures him by having sex with men and women, in which he cannot participate. Eventually driven mad, he proceeds to make his escape.