After getting dumped by her boyfriend right before Christmas, a woman decides to fly home to Connecticut for the holidays. But due to bad weather, her flight is diverted to Montana and she ends up sharing the last available hotel room with a man she met on the plane.

Five years after her husband was killed in a tragic car accident, Linda starts to rebuild her life and gets re-married, to her late husband's business partner Greg. When her daughter Scarlett returns home from college, she notices her new stepfather is behaving oddly and suspects that he might be having an affair. She follows him and seems to confirm her suspicions when he meets up with another woman. Things get scarier, though, when a day later on the news, the same mysterious other woman is reported dead. Scarlett starts to wonder - who is this man living in their home? Written by ViKs