After the shocking untimely death of her husband, Shelley Stratton (Catherine Hicks) moves her daughter Alexis (Emily Hirst) and her adopted daughter Laurie (Alexz Johnson) to their remote summer house to give her family a fresh start. As Laurie begins to settle in and put her life back together, she gets the eerie feeling that she is constantly being watched. Her uneasiness grows when people start claiming to see her in places she has never been. The family's delicate state unravels when Laurie unearths her dark past, discovering a twin sister that she never knew she had. Laurie is forced to delve deeper into her twin's secrets, for it turns out her twin has been locked up for years. Laurie must now understand their strange connection in order to prevent her sister from taking over her life and harming her loved ones.