In a small town called Portland, single mother Susan Harding (Sela Ward) lives with her two children Sean (Braeden Lemasters) and Beth (Skyler Samuels), while her eldest son Michael (Penn Badgley) is studying at a military academy in another place. One day, Susan met a single man named David Harris (Dylan Walsh) in a supermarket. David behaved properly and spoke humorously, just like a perfect family man. The two met too late, and it took only half a year for them to talk about marriage. The Harding family was quite satisfied with David, but Michael seemed to be skeptical. His scruples were not without reason. After a period of getting along, Michael discovered that behind David's gentle and cheerful appearance seemed to be a dark and terrifying side. He tried to investigate everything about David, but it might be too late...