Mapleton, New York, small-town police chief Kevin Garvey juggles personal and professional challenges as the three-year anniversary of The Departure - when millions of people worldwide suddenly vanished - approaches.
A nativity scene goes wanting sending Kevin scurrying to find the culprit. Tom and Christine run into trouble at a hospital and on the road. Kevin retrieves a surprise detainee from a neighbouring police station. The Guilty Remnant put their stamp on the holiday season.
After learning his father has escaped the psychiatric hospital, Kevin orders an APB to track him down. Jill attempts to break an endurance record. Holed up in Indiana, a disillusioned Tom makes an unsettling discovery.
Phillip and Elizabeth Jennings seem like any other American married couple, but they are actually highly trained Soviet spies, who must kidnap a high-ranking defector and return him to Russia.
Phillip is reunited with an old flame and the reunion leaves him questioning the nature of his relationship with Elizabeth. Meanwhile, Stan and Nina finally give in to temptation.