When the kill count of a mass-murdering arsonist active in a small town reaches 31, the BAU are called in.
Midge takes the stage for a foreign audience, while Abe and Rose find themselves in a new world. Susie experiences the repercussions of having a bad reputation in the business, as Joel regroups after quitting his job.
Devon is concerned when a mother's complaints go unaddressed after her delivery, and he pushes Bell to take drastic measures.
NCIS looks into the disappearance of a Navy lieutenant commander who is working on foreign cyber threats with the NSA; the team celebrates the holidays.