La gemella erotica
The plot revolves around a psychiatrist named Tony and two identical twin sisters, Norma and Mary. Norma and Mary are apparently very different from each other, to the point of conflict. Mary ends up blackmailing Norma, and Tony (who is either married to or in a relationship with Norma) is somewhat involved, as it would seem that Tony is occasionally seeing Mary as a patient in his office. Revelations near the end of the film suggest a far more complex situation, and Mary’s lover ends up in a position to kill. There is also a very brief subplot involving another of Tony’s patient’s who ends up raping and killing a woman before regressing into utter insanity.