Considering that the Female Prisoner Scorpion movies are essentially exploitation films (though interestingly it seems the concept doesn't exist in Japan), Jailhouse 41 is the one that breaks all the rules. It functions certainly as an exploitation film but moreover is startlingly art-house and innovative, for instance in how it tells the back-stories of lead characters. (I won't spoil how.) And at the centre is a near silent Meiko Kaji who does more with her expression than a million lines of dialogue could ever hope to convey. True, there are some scenes that are not pleasant (but intentionally so) and the men are almost all cartoonishly terrible human beings but this a true diamond in the rough and a film that you hope to find: unique, remarkable and that you want to watch time and again.