The ridiculously beautiful Christina Lindberg plays the adult Frigga, who is tricked/kidnapped by the incredibly slimy Tony (Heinz Hopf). He is a pimp and drug dealer who forces Frigga into sex slavery and heroin addiction. Tony's modus operandi is to seduce women, drug them and force their services with only the promise of more drugs. When Frigga assaults her first client, Tony decides to teach her a lesson; a lesson that gives her the moniker "One-Eye."
After listening to the other girls, and how they make some extra cash in hopes of escape and rehab, Frigga decides to do the same. When she finds that the letter Tony wrote to her parents caused them to commit suicide, escape becomes less of an issue. She now wants revenge.
Oddly, Frigga seems to have time away from her prison. They don't explain why she is allowed to leave, but I assume she has made herself a model prisoner to gain Tony's trust, coupled with her heroin addiction (Tony tells her that she will not find similar quality on the street—he does get his from a doctor). She uses her funds and time away to train in hand-to-hand combat, firearms use, and rally car driving. This is interesting, as most films skip the whole "how did she become such a bad ass" portion of the story. Once Frigga is ready, she goes to work, first killing her clients, then going after Tony. A few wrong-place-at-the-wrong-time people fall prey to her insane tactics, but you have to break some eggs, don't you?
In all, this is a really great exploitation/women's revenge film. Probably the best. I dare say it is a better revenge film than Coffy, despite my love for the über-awesome Pam Grier. Know that there are some actual hardcore sex scenes in this. They are not long, but are penetration shots. I imagine there was a double for Lindberg, as she is never seen in-full during them, but who knows?