Cecilia (Elisabeth Moss) could never have imagined that Adrian (Oliver Jackson-Cohen), a handsome man who once fascinated her, would now become the initiator of nightmares. Not long after falling in love with herself, Adrian began to control Cecilia mentally and physically. Finally, Cecilia, who could not bear it any longer, used tranquilizer to knock Adrian unconscious late one night and successfully escaped from the magic cave. Afterwards, Cecilia was shocked to receive the news that Adrian had committed suicide. She could hardly believe that this demon had really disappeared completely from her life. Cecilia's doubts were not groundless. In every corner of her life, there seemed to be an invisible shadow peeping at her, trying to touch her.