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The narrative then shifts to the night before, with Kristen McKay (Liv Tyler) and James Hoyt (Scott Speedman) arriving at the Hoyt family's isolated summer home. There is obvious tension between the two, and flashbacks reveal that James had proposed to Kristen earlier in the evening, and his proposal was rejected. While discussing their relationship, the couple is interrupted by loud knocking at the front door. James opens the door to find a young woman with blond hair who asks if "Tamara" is home. They tell the girl that no one by that name lives there and the girl leaves, so they close the door. James then leaves the house shortly after.

While Kristen is alone in the house, the young woman returns, once again knocking on the door and asking for Tamara. Without opening the door, Kristen tells her that she has already visited their house and that Tamara is not there. Moments later, she hears a barrage of loud knocks coming from all over the house. The fireplace sets off a fire alarm and Kristen breaks the alarm trying to turn it off and it falls to the floor. Kristen attempts to call James on her cell phone but the battery has died. She plugs the phone in to charge it and calls James on the land line to inform him that the blond girl has returned. A few minutes into the phone call, the line goes dead. Kristen hangs up before spotting the fire alarm, now fixed, on a chair. Scared, she arms herself with a knife and finds that her mobile phone is now missing; the camera reveals it to be burning in the fireplace. While Kristen is looking through the window to the yard, a man in a sack mask suddenly steps into view. Kristen runs down the hall. The front door opens and Kristen approaches it. The girl from earlier, now donning a doll-like mask, steps into the crack in the door. This obviously frightens Kristen and she locks the door. Kristen then runs and hides in the bedroom, James arrives.

At first skeptical about Kristen's claims, he begins to believe her when they find blond girl, now wearing a doll mask, staring menacingly at the house on the front lawn. James goes outside to retrieve his own phone and find his car hot wired with the tires slashed and the windows all broken. After the couple try unsuccessfully to escape in the smashed car, James arms himself with a shotgun and they both hide in a closet. James' friend Mike comes around after receiving an earlier call from him, however, when he tries to enter the bedroom, James shoots him, believing him to be an intruder. After attempting to calm down, the two discuss their options.

Remembering that there is a radio in the barn outside, James leaves Kristen in an attempt to get help. However, while crossing the lawn to get to the barn, he is ambushed by Pin-Up Girl and the Man in the Mask. The Man in the Mask returns to the house and his heavy breathing is heard by Kristen who flees the house towards the barn and falls into a ditch, breaking a foot in the process. The Pin-Up Girl quietly stalks Kristen unnoticed who crawls into the barn and finds the old radio. Kristen manages to raise someone before the equipment is destroyed by the Pin-Up Girl. Kristen flees back into the house where she is eventually cornered and knocked out.

In the early morning, Kristen and James wake up, tied up next to each other in chairs. Kristen asks the attackers why they are doing this to which Dollface simply replies, "Because you were home." The three killers take off their masks and take turns repeatedly stabbing James. As the killers finish with James and begin stabbing Kristen, the camera shifts to shots around the outside of the house as numerous screams are heard. A wounded Kristen wakes up on the floor next to James' body to the sound of Mike's cell phone going off. Kristen drags herself to Mike's body and upon grabbing the phone, the Man with the Mask returns, takes the phone and calmly leaves the house, leaving Kristen to slump to the ground, apparently dead.

Finished, the three killers drive away from the bloody scene, stopping when the young boys with bicycles pass them on the road. Dollface stops and asks for one of their pamphlets about "Christian living". When asked if she was a sinner, Dollface responds, "sometimes." She takes the pamphlet and gets back into the car as the Pin-Up Girl says, "It'll be easier next time." The young boys are then seen passing the Hoyt house and upon noticing the damage to the vehicles outside, enter the building to find more destruction and various blood splatter. As they search the house, they find the bodies of James and Kristen. As one of them bends down to inspect Kristen, Kristen opens her eyes, grabs the boy's arm and screams.