If this brings "Cities in Flight" to mind, Wilson wrote this after a few of those stories had appeared. Review:
. . . The novel plays out as a series of reactions by the resident of Superior, Ohio, to their extraordinary situation. When it finally comes time to explain how the town was levitated, we don't even get treated to the thrill of the characters taking action to solve their own mystery. The 'Big Reveal' about why everything is happening is not clever either.
Instead, Wilson resorts to "magical explanations" thinly disguised as elements of science fiction, as in: The aliens did it.
Not to spoil anything, but if that didn't stop "Under the Dome," I don't know why it should matter here.