The problem with this movie concept is if you're going to have a story where one twin goes psycho at least make sure your cast looks exactly the same, or cast one person in both roles. These two women are Sisters in real life, but they don't look identical. So when the psycho tries taking her sisters place you know right away it's not the good twin. Even down to how they walk. It's a glaring mistake.
Also.... Why Angie Everhardt?