The young Jill Johnson is being punished by her parents after going over her cell phone minutes. She is not allowed to drive or use her cell phone. She is hired to baby-sit for a couple. After showing her around, the children's parents leave, and Jill feels she can mind herself, knowing the kids are upstairs recovering from the flu. Now that she's alone she snoops around the house until she hears a loud bang.

Jill believes it's simply Rosa, the live-in maid, or Dr. Mandrakis returning to get something, so she ignores the noise. She sits down and reaches for the phone. Just before she picks it up, it rings. There is just heavy breathing on the other end of the phone. After a while Jill hears the line go dead and she hangs up. She notices Rosa is no longer feeding the birds in the atrium.

After receiving another call, Jill finds that this one came from her friend Tiffany who has come to visit her, when she asks how Tiffany got it, she replies that the garage door was open, Jill closes the garage door while Tiffany looks for some alcohol to drink, when Jill asks her to leave she tries to persuade her to come to the bonfire party with her but Jill refuses so Tiffany leaves, while she reaches her car, she hears footsteps in the woods next to the house and rushes to get in her car, dropping her keys, when she picks them up she gets in the car only to find it won't start up. After trying several times it does and then she reverses the car to find a branch blocking the gate. After rushing out to move it, we see the view of the camera rushing towards her from behind, the camera then shows Jill who hears banging on the front door, she races to it thinking its Tiffany, when she opens it she finds no one there, she closes it and returns to the living area.

Jill gets more phone calls only to realize the person calling can see her. Then, he says the legendary line, "Have you checked the children?" Jill goes upstairs and checks on the children. Once she sees that they are okay, she goes back downstairs. As she reaches the bottom of the stairs, the phone rings. She answers it and hears the person say, "How were the children?" She calls the police, but they say unless he's making a real threat to her they can't do anything. Finally they agree to trace the call. When she's done on the phone, she sees someone inside the guest house near the main house. She thinks it is Todd (the father's older son) or Rosa and decides to go there. Jill takes a flashlight and a candle stick as a weapon and runs to the guest house. She enters and finds the room empty, but when she looks out of the window, she sees a light go on in the children's room. She races back to the house and goes up to the third floor to Rosa's room. She finds this empty too, with the shower turned on in Rosa's bathroom. As she stands there, the police call to warn Jill that they have traced the call, and that the caller is somewhere inside the house. Suddenly she hears a phone ring and wearily turns around, and she is overwhelmed with sadness and fright as she finds out that it is her friend Tiffany's (who joined her at the house earlier in the night) cell phone ringing. Finding Tiffany dead in Rosa's bathroom, Jill goes downstairs to get the two children. She finds them in a toy chest in a small bedroom. When they're about to leave the bedroom, Jill sees the stranger on top of a rafter in their open wooden ceiling.

Jill and the children run inside the bathroom as the stranger jumps from the ceiling. Jill ties the door handle to a hook on the wall and locks themselves in. The stranger tries to get in the room as Jill and the kids make an escape to the indoor glass shielded water garden/atrium. The stranger makes it downstairs again and attacks Jill, who is hiding underwater. When the children run to the main door, they are too small to unlock it. Jill finds Rosa's dead body in the water. She also traps the man in the atrium (ripping some of her hair out in the process) and finds the kids in the fireplace. They all run for the door, but the stranger breaks out and chases after them. The kids make it out, but Jill is pulled back inside. She fights the stranger, and eventually stabs his hand with a fire poker, pinning him to the floor. She manages to escape, and runs into the arms of a police officer, who has just arrived. While she is leaving to go to the hospital she sees the killer in a police cruiser. They look at each other and the cruiser drives away. The police say they will have 4 officers on him around the clock but Jill simply replies "That's not enough." The audience learns that the killer is responsible for the murders of 15 people, most of them being young women and children. News reports state that the police are looking for the links between the victims and that the killer's identity is unknown at this point.

Later, as Jill is recovering in the hospital, she finds herself alone with a ringing phone echoing through the halls. She turns around to see the stranger reflected behind her in the mirror. She screams and screams, however, it is just a dream. Doctors run in to assist her as she cries "He's in the house! He's in the house!!" As the camera pans out, more people rush in the room to help her, showing that she was psychologically terrorized from the whole experience.

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