I thought it was a twin situation. I can see why it has little mention as a horror film. Similar to something like the Mad Room which is really lame as a suspense/horror film, it feels more like a showcase for Carole Lynley to have crazy hair in some scenes.There was a deranged woman in the attic who killed the father and did something awful to the daughter , scarred her physically . You got no information about what went on.