An invisible and mysterious force field descends upon a small actual town of Chester's Mill, Maine, USA, trapping residents inside, cut off from the rest of civilization. The trapped townspeople must discover the secrets and purpose of the "dome" or "sphere" and its origins, while coming to learn more than they ever knew about each other and animals too.
They are all trapped inside.
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Did You Know?
Chester's Mill is in the state of Maine. See more
[Opening narration, season 1
Chester's Mill is a place like any other. At least, it used to be until we were cut off from the rest of the world by a mysterious dome. Invisible, indestructible, and completely inescapable. We're trapped. We don't know where it came from or why it's here, but now that we're all trapped under the dome together, none of our secrets are safe.