When she discovers e-mail evidence of her husband's infidelity, Annie Milliken is shattered. Dismissing his pleas of innocence, she leaves their home in Kentucky and takes their baby daughter to western Massachusetts and the safe harbor of her identical twin sister, Julie. But Annie's sense of security evaporates when she arrives into a crime scene: a woman who resembles Annie and Julie has been murdered right in front of Julie's house.
Annie and Julie cooperate with the murder investigation. Meanwhile, the sisters become as close as they were growing up, spending their days together, dressing the same, sharing the baby. But when Annie applies for a job, everything comes undone. Her credit cards are stolen just as she's arrested for grand larceny. She realizes that she is the victim of identity theft, but has yet to understand the true scale of the crime. As her losses continue to mount with the abduction of her daughter, Annie fears that a deeper, darker crime has been at play all along.