There is a man in a santa mask who killed six families. It goes back and has a perspective on one of the families. They are listening on the radio to the news and find out about the serial killer. It goes through and says how they were killed and blah blah. They're Not that scared until night time when they hear the basement door break open. They are killed (LOTS OF DETAIL) Secret Santa
Murderer with a mask on Christmas Eve kills 6 families
Museum guy with old painting reveals secret details about the murder and how the painting of Santa ties back to it being a crime around Christmas