It's Christmas in Seattle, and Liv is called in on the case of a shop teacher who pursues criminals at night as a costumed vigilante... and turns up dead. Meanwhile, Major makes the acquaintance of a new zombie.

Liv and Clive investigate the poisoning death of a librarian who wrote erotic literature. Meanwhile, Clive and Dale tie Blaine to the Meat Cute Massacre and the Chaos Killer... but Peyton gets him released because of his testimony against Boss.