Desperate to repay his debt to his ex-wife, an ex-con plots a heist at his new employer's country home, unaware that a second criminal has also targeted the property, and rigged it with a series of deadly traps.

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.