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.

In the wake of a series of disturbing encounters, Kevin visits a therapist. Tom finds himself in a precarious situation with Christine. Meg is asked to part with pieces of her past. Jill and Aimee tail Nora Durst, a local celebrity since her entire family disappeared.

In the face of dwindling church attendance and threats on his life, the Rev. Matt Jamison continues to preachhis gospel: that many who disappeared were sinners and not saints. Matt's campaign is detoured when he learns he may lose the church to foreclosure.

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.

Laurie's resolve is put to the test in the wake of a brutal hate crime. After his latest initiatives to maintain the peace fall short, Kevin turns down an outside offer to rid the town of its problems. Matt brings his pulpit to the street, and Meg takes on a new role.

Nora Durst finds herself adrift during a Departure-related conference in New York. Agitated that her ID has been pinched, Nora scours the convention for her imposter, and ends up getting detoured by an amorous salesman, a best-selling author, and a rogue attendee.