The camera is one Kevin Mcallersters house and it is night  and you see him putting out the trash and Kevin sees the guy shovelling 160;snow and Kevin brother told him he is a murderer so he screams and runs
we should rob that house 
You see a car pick up Kevin's family but Kevin isn't there (his family has left him while they are on holiday to France)
Kevin realises he is home alone and he is partying when he sees a van outside and he goes outside to look, the van speeds off and he is curious
Kevin saw the same people who were in the van.They were talking about robbing a house. Kevin realises and he starts preparing his house in case they rob his
It was time they were outside, Kevin called the police and in the meantime they entered the house and were surprised by a hot handle and crushed Christmas baubles.They went upstairs and Kevin shouted incoming and paint tins came flying down and knocked them down
The 20 police cars and 2 helicopters arrived and kevin opened the door and said your a bit late and they were sitting on his led and kevin pulled him to the door and said he's all yours and the police took them to the station