Nell (Keira Knightley) and Simon (Matthew Goode) have invited their closest friends to join their family for Christmas dinner at their idyllic home in the English countryside. As the group comes together, it feels like old times - but behind all of the laughter and merriment, something is not quite right. The world outside is facing impending doom, and no amount of gifts, games or Prosecco can make mankind's imminent destruction go away.