Director: Jenn Wexler Writer: Jenn Wexler, Sean Redlitz Cast: Mena Massoud, Olivia Scott Welch, Chloë Levine, Madison Baines, Georgia Acken, Derek Johns, Laurent Pitre Running Time: 100 mins After a group of Christmas carollers leaves the front porch of an ordinary suburban house, four people watching from the darkness move in, immediately stabbing in the