After a violent storm, a dense cloud of mist envelops a small Maine town, trapping artist David Drayton and his five-year-old son in a local grocery store with other people. They soon discover that the mist conceals deadly horrors that threaten their lives, and worse, their sanity.
A freak storm unleashes a species of bloodthirsty creatures on a small town, where a small band of citizens hole up in a supermarket and fight for their lives.