A crazed artist photographs the murder of women, using the photos as models for paintings; he disposes of the bodies by encasing them in plaster as sculpture. Two female private detectives, Janine Raynaud & Rosanna Yanni, investigate.
The title of the English version reads "Two Undercover Angels" so the "Sadisterotica" business has clearly been tacked on recently, presumably to market the film to current cult/trash movie audiences.
For this early film (1967, made alongside the vastly superior "Succubus") Franco was still working in a regular genre (comedy thriller with a bit of sexploitation) and working with a regular budget, cast, crew & production set up. That is to say, it's reasonably well-made. Franco still manages to include many of his usual idiosyncratic fetishes & the film has some pop-art swinging 60s touches. It's also part of the spoof spy/thriller genre that was so popular in the 60s. However, this is basically a Eurotrash comedy. With the American dubbing any comedy nuance/timing (supposing there was any) is lost. And anyway, are you interested in Spanish broad farce from the 60s? Probably not - at least this is probably not what you look for in a Jess Franco movie. Fans of Franco's vintage period may find something to enjoy in "Sadisterotica" but everyone else should approach with caution.