It is about a teenage girl who is babysitting and she keeps getting phone calls,and doesnt know who it is, then she calls police and the are able to trace the call which is coming from inside the house and her and the kids are trying to escape the house, but he wants to kill the girl and finally the kids get out and the intruder grabs her and they fight and she runs out of the house into the arms of a police officer and they capture him and he is a mass murderer, it is a really good movie!!!!