Bizarre, fairly engrossing film starring Grant and Kane as the strange daughters of a deceased anthropologist, who specialized in the study of wild primates. Grant, the more normal of the two, is a noted solar astronomist. Kane, however, is quite mad, and spends most of her time creating
art pieces and torturing her father's apes in the huge Mafu cage. Grant keeps her sister at home rather than in an institution, and it becomes clear that the siblings share a sexual relationship. Eventually Kane's madness begins to overtake Grant, as her fears of men (Olson is her coworker and
lover for whom she feels no commitment) and dissatisfaction with heterosexual sex (the se...