A mysterious dome-shaped force field covers the town of Chester's Mill and isolates the town from the outside world. While they can see through the barrier, sound doesn't travel through it so they are unable to communicate outside of the town too. While that's problematic, there are also a few mysteries within the town to be revealed. A town councilman, Big Jim, was stockpiling propane for an unknown reason. And, an outsider, Barbie, came to down and killed Julia's husband.