Christmas caroling is a Moody tradition that Sean Sr. does not take lightly. However, when an unexpected guest shows up to the Moody house, caroling takes a hilariously embarrassing turn.

Sean Jr. finally agrees to join Sean Sr.'s Moody Heating and AC business, but trouble ensues when a rival company infringes on their territory. Meanwhile, Bridget finds someone in whom to confide, while Dan struggles with the guilt of being interested in cousin Marco's girlfriend, Cora.

With Christmas quickly approaching, Sean Sr. receives the top honor as the lector of Midnight Mass.