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Countess Edna Luise Von Stein keeps her disturbed sister Milly prisoner. Confined to her bed, Milly suffers from a deep sexual trauma resulting from being raped as a child by a muscular gigolo after she had surprised him and her sister in bed. Is Milly incurable, or is that her sister left out of their father's will and Molly will be the sole inheritor of his immense fortune on her 21st birthday? Edna and her accomplice Dr. Barrios have hatched a plot to have Milly declared insane. Over the years Barrios has been injecting Milly with a drug that has turned her into a nymphomaniac. Milly's only hope is Joe, the only one of her numerous lovers to have ever succeeded in pleasuring her, who has fallen in love with her. Will he succeed in rescuing her from Edna and Barrios, and will Milly be able to live a normal life?nnDirected by nJesús Franco ... (as Jess Franco) Writing Credits nErwin C. Dietrich ... (screenplay) (as Manfred Gregor) Cast (in credits order) nPamela Stanford Pamela Stanford ... Edna von SteinnKarine Gambier Karine Gambier ... Milicent Antonia von SteinnJack Taylor Jack Taylor ... Dr. Charles Barnes (as Jack Tylor)nEsther Moser Esther Moser ... SarahnKurt Meinicke Kurt Meinicke ... JoenMarianne Graf Marianne Graf ... MarianEric Falk Eric Falk ... Tom (as Erik Falk)nRest of cast listed alphabetically:nWalter Baumgartner Walter Baumgartner ... Prof. Sebesky (uncredited)nMike Montana Mike Montana ... Giglio (uncredited)nProduced by nErwin C. Dietrich ... producer Music by nWalter Baumgartner Cinematography by nPeter Baumgartner Production Management nWerner Zeindler ... production manager Crew believed to be completennRelease DatesnWest Germany 2 September 1977 nFrance 19 September 1979 nSpain 8 November 1981 (Barcelona)nSpain 15 February 1982 (Madrid)nAlso Known As (AKA)n(original title) Die teuflischen SchwesternnAustralia (dubbed version) Swedish Nympho SlavesnFrance Deux soeurs vicieusesnItaly Frenesie erotiche di una ninfomanenSoviet Union (Russian title) Бешеные сестрыnSpain Aberraciones sexuales de una rubia calientenSwitzerland (English title) Satanic SistersnUSA Sexy SistersnWorld-wide (English title) (informal alternative title) The Devilish Sisters
