Thirty years ago, teenager Rebecca Underhill and her twin sister Molly were abducted by a man who lived in a house in the woods behind their upstate New York farm. They were held inside that house for three horrifying hours, until making their daring escape. Vowing to keep their terrifying experience a secret in order to protect their mother and father, the girls tried to put the past behind them. And when their attacker was hunted down by police and sent to prison, they believed he was as good as dead. Now, it's 30 years later, and with Molly having passed away from cancer, Rebecca, a painter and art teacher, is left alone to bear the burden of a secret that has only gotten heavier and more painful with each passing year. But when Rebecca begins receiving some strange anonymous text messages, she begins to realize that the monster who attacked her all those years ago is not dead after all. He's back, and this time, he wants to do more than just haunt her. He wants her dead.