The late '70s French-dubbed release version of this film has over 10 minutes of added hardcore sex scenes, mainly appearing at the beginning of the film, featuring anonymous performers, yet its overall running time is 20 minutes shorter than the original Italian film.
Ornella Muti recalls that during a scene, bent over a corpse, she had to cry but couldn't. So Damiano Damiani gave her a slap in the face. "I was so traumatized that even today, when they ask me for tears on the set, I remain stuck"-she says.
Based on the true story of Franca Viola.