Silvia Hacherman (Mimsy Farmer), an industrial scientist, becomes increasingly disturbed by a series of apparently supernatural visitations. In fact, she is hallucinating…Her visions include a seductive woman who appears when she is about to make love with her boyfriend Roberto (Maurizio Bonuglia), and a young girl who becomes a seemingly constant companion.

As her psychosis begins to take hold, even neighbors, friends and Roberto, her lover, begin to take on sinister significance. It transpires that as a child Silvia pushed her mother off a balcony to her death. She becomes increasingly violent and also ends up falling to her death. However, her entire descent into madness and her demise seem to have been orchestrated…