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 prior, in which a family was killed in cold blood on Christmas Eve. In the ensuing years, the house has been shuttered and left exactly as it stood on that terrible night. Shane and Alexa...