SPOLILERS...kind of.
There is so much going on in this movie it's hard to know where to start. The key is a line where the girl's lawyer says, "All who approach you are perverts, insane. But it's all in your little mind." Looked at in that context, the "plot" means nothing since it's more about thoughts than action.
That said, the central character, called only "The Prisoner" is arrested for the murder of her lover, Nora. The two are in a Domme/sub, BDSM relationship with The Prisoner portrayed as the Dominant.
Many characters take on double meanings. The police, it seems to me, represent the author, asking supposedly meaningless questions that would only make sense if you were creating a rich background life for a character such as The Prisoner. One of the cops, rather than documenting the crime, blatantly records the themes of the movie: "Themes of broken bottles". Bottles stand in for the wombs and this refers the broken mother/daughter relationship between...
...The Prisoner and Nora. Nora is her mother. The same cop that records themes rather than evidence, has a scene where he recites words while writing and researching something (probably the screenplay being filmed) in the bed Nora was killed in. This is crosscut with The Prisoner being show objects and free associating. The cop says "parricide". The Prisoner says "disassociation".
Throughout the movie, Nora seems the submissive except for one scene - when the Prisoner sells herself to a man looking for deviant sex. She takes them up to the room. Nora lounges in a window seat. Stepping back, the actual "plot" revolves around Mother Nora selling and sexually abusing her daughter.
Her court-appointed lawyer (read "protector") is played by the same actress that plays Nora. At first, Nora acts like the mother The Prisoner wants/needs - strict and no-nonsense. But, The Prisoner's insanity seduces Lawyer/Mom/Nora, or at least that's the scenario The Prisoner dreams up. The Prisoner ends up killing Lawyer/Mom/Nora in very similar circumstances.
Plot-wise, the police find that Nora was NOT killed by the prisoner. They come to tell The Prisoner this and find The Lawyer dead. "We'll have to start over", the cop says.
What the director presents to us is a portrait of The Prisoner, deep in the clutches of her disassociation, creating a world that's easier for her to live in - where she controls her mother, dressing her as a manikin and, just by thinking about it, causes people to die. It's complex, gorgeous and, if not actual porn, has enough nudity to satisfy that requirement if that's what you're looking for.
