Fact1: Edwards goes downstairs with luggage and fixes himself and coffee, Fact2: Susan Harding is shopping in grocery store with youngest children, Fact3: man lost wife and daughter in car crash, Fact4: Susan 's eldest son returns home from military school, Fact5: David invites him down to basement
Output: The film opens as Grady Edwards Dylan Walsh transforms himself in a bathroom. He shaves off his beard, dyes his hair, and removes his brown contact lenses. He goes downstairs with his luggage and fixes himself peanut butter toast and coffee. As he leaves the house, the camera reveals the bodies of his wife and her three children. Susan Harding Sela Ward is shopping in a grocery store with her youngest children where she meets Grady, who introduces himself as David Harris, a man who lost his wife and daughter in a car crash. He charms her, and six months later, they are engaged to be married. Susans eldest son, Michael Penn Badgley returns home from military school and is wary of the situation. David invites him down to the basement, where he has installed locked cabinets, and tries to befriend Michael over tequila shots. Michaels suspicions start when David uses the wrong name when mentioning his deceased daughter. After Susan says that an elderly neighbor warned her that Americas Most Wanted ran a profile on a serial killer that looked like David, David barges into the womans house and throws her down her basement stairs, breaking her neck. Susans exhusband Jay confronts David angrily about laying hands on his younger son, Sean, after David grabbed the boy roughly for failing to turn down the volume on his video game. He warns Susan that she knows nothing about David. Doubts about David mount further when he quits his job working as a real estate agent for Susans sister, Jackie Paige Turco, to avoid displaying a photo ID and other forms of identification. Later, Jay confronts David about an apparent lie regarding his college history. David clubs him with a vase and suffocates him with a plastic bag. He sends Michael a text with Jays phone saying that David checked out okay. When the neighbor womans body is discovered two weeks later, David tells the family. Michael is alarmed because he overheard David being told by the mailman, who gave less detail than David. While Michaels girlfriend, Kelly Amber Heard, tries to get him to focus on college applications, he grows more obsessed with the contradictions in Davids stories. Michael is obsessed with Davids stories and Kelly leaves. The situation comes to a head when David intercepts an email from Jackie about hiring an investigator. He then goes to Jackies house and drowns her in her pool. Determined to discover what was in the locked cabinets, Michael breaks into the basement as Kelly keeps a lookout. In the basement, Michael eventually discovers his dads body in a freezer. David knocks out Kelly and traps Michael in the basement. The commotion awakens Susan, and he berates her parenting skills and says that he thought she could be Mrs. Grady Edwards. On Susans stunned reaction, David grimaces and asks, Who am I here?, Susan tries to snap him out of it, saying his name, causing him to say David! Im David Harris! Susan, realizing the situation after noticing the unconscious Kelly, flees to the bathroom, locking herself in. David kicks the door in, shattering the mirror behind it. Susan picks up a shard of the glass mirror, holding it behind her. David grabs her, they struggle, and she manages to stab him in the neck with the shard. He falls to the floor, apparently dead. Michael escapes from the basement and finds Kelly. They find Susan in the hallway across from the bathroom, thinking David is dead. Then David approaches from behind and blocks the stairs, chasing all of them into the attic, where he and Michael fight. Both fall onto the roof and then off the edge of the roof to the ground, where they lie unconscious. When Michael wakes up, he finds out he had been in a coma for just over a month. He learns that David is still alive and fled the scene before the police arrived. The end scene shows David, who has again changed his appearance and his name to Chris Ames. He is working at a hardware store when he meets a woman Jessalyn Gilsig who was shopping with her two sons.