It's a few days before Christmas when Detective Shane Scully and his wife, Alexa, respond to a call in the Hollywood Hills. The crime scene is the pristine backyard swimming pool of a once-immaculate mansion on Skyline Drive, the site of an infamous murder decades past, in which a family was killed in cold blood on Christmas Eve. In the ensuing years, the house has been shuttereed and left exactly as it stood on that terrible night. Shane and Alexa arrive to discover the aftermath of a lavish party. The revelers have fled, leaving three dead bodies, all shot with the same gun, one is acclaimed film producer Scott Berman. The others, a pair of gorgeous women in their early twenties.