After her husband's shocking untimely death, 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 settles in and starts to put her life back together, she gets the eerie feeling that she's constantly being watched, and her uneasiness grows when people start claiming to have seen her in places she has never been. The family's delicate state unravels when Laurie unearths her dark past and discovers a twin sister that she never knew she had, and is then forced to delve deeper into her twin's secrets. She must understand their strange connection to prevent her twin from taking over her life--and harming her loved ones.