I have seen all of the Ilsa movies several times and this one is by far the best. First, a warning: if you are easily shocked, offended, or disturbed, you won't make it through this (or any other Ilsa)movie. It takes a lot to disturb me, but this movie did the trick. If you love campy women's prison movies, this is also a must-see, though it is darker than most of them.Yes, this is an exploitation flick and does not try to hide this fact, but it has a plot, and characters you care about. A woman's sister is being held in a women's prison, so she goes 'undercover' to try to rescue her. The b*tch in charge of the prison is the most twisted, sick, evil, sadistic warden you will ever find in any women's prison movie--Ilsa, (or Wanda, depending on which version you see) the Wicked Warden. Her idea of a nice relaxing evening is using one of the female inmates for a pincushion, and I am describing the scene tactfully. Others she lobotomizes when they get out of line. The woman's plan to infiltrate the prison and her sister goes horribly awry when she realizes things in there are much, much worse than she could have dreamed of and there is no escape. The movie's ending is a total show-stopper, when Ilsa comes to one of the most fitting, vividly grisly, ugly endings that you will ever see. Not the most pleasant movie to watch--the first time I saw it, I felt sick for not turning it off and continuing to watch the horrible acts being committed. However, I've seen a lot of really bad horror/shock/exploitation films, and this one really stands out amongst the rest, with realistic characters, the courage to have a very downbeat ending, and no glamourization of the violence. The images in this movie will stay with you for a long, long time. For some people, that's a warning, for others, a strong recommendation. You think you've seen it all? You haven't, till you've seen this.