From master of terror Brian de Palma comes this stylish psychological thriller that will keep you on the edge of your seat until the final frame. Carter Nix (Lithgow) is a respected psychologist, loving husband and devoted father who decides to take a year off to help raise his daughter. Carter's wife Jenny is pleased to have her attentive husband home - at first. When Carter shows obsessive behavior toward their daughter, Jenny becomes concerned, and to complicate matters, Jenny's old flame re-enters her life. But nothing can prepare her for the emergence of Carter's multiple personalities, and a fiendish plot to recreate the infamous experiments of his deranged father.