On an entirely normal, beautiful fall day in Chester’s Mill, Maine, the town is inexplicably and suddenly sealed off from the rest of the world by an invisible force field. Planes crash into it and fall from the sky in flaming wreckage, a gardener's hand is severed as “the dome” comes down on it, people running errands in the neighboring town are divided from their families, and cars explode on impact. No one can fathom what this barrier is, where it came from, and when—or if—it will go away.

Dale Barbara, Iraq vet and now a short-order cook, finds himself teamed with a few intrepid citizens—town newspaper owner Julia Shumway, a physician’s assistant at the hospital, a select-woman, and three brave kids. Against them stands Big Jim Rennie, a politician who will stop at nothing—even murder—to hold the reins of power, and his son, who is keeping a horrible secret in a dark pantry. But their main adversary is the Dome itself. Because time isn’t just short. It’s running out.

From Wikipedia

Under the Dome is a science fiction novel by Stephen King, published in November 2009. It is a rewrite of a novel King attempted writing twice in the late 1970s and early 1980s, under the titles The Cannibals and Under the Dome. As King stated on his official site, these two unfinished works “were two very different attempts to utilize the same idea, which concerns itself with how people behave when they are cut off from the society they’ve always belonged to. Also, my memory of The Cannibals is that it, like Needful Things, was a kind of social comedy. The new Under the Dome is played dead straight.” From the material originally written, only the first chapter is included in the new novel. There are also talks of the novel becoming a cable series.