Four years later, a newly divorced woman, medical doctor Sarah Cassidy (Elisabeth Shue), and her 17-year-old daughter Elissa (Jennifer Lawrence) move to a small upscale town. Their house is near the house where the massacred family lived. As told by the neighbors, four years prior a girl named Carrie-Ann Jacobson killed her parents, then fled into the forest and was never seen again, leaving her brother Ryan (Max Thieriot) as the sole survivor.