Description: A cozy house in the English countryside. The tree has been lovingly decorated. A grand feast is being prepared. Over the sound system, Michael Bublé croons about holiday sweaters. Nell (Keira Knightley), Simon (Matthew Goode), and their boy Art (Roman Griffin Davis) are ready to welcome friends and family for what promises to be a perfect Christmas gathering. Perfect except for one thing: everyone is going to die.