Moonshiners Mark, Tim, and Josh drive the notorious Thunder Road in Dawson County, Georgia, to investigate the murder of "Lightning" Lloyd Seay, a notorious bootlegger turned pioneering stock car racer who was killed over a few bags of sugar.

For legendary outlaw Popcorn Sutton, freedom means answering to a higher law, making tax-free liquor as his forefathers did. But now that Popcorn's in the government's crosshairs, no moonshiner in history has ever felt more persecuted by the law.