Americans on vacation in the Caribbean take a tour of a nearby island at night and watch a local voodoo ritual. Soon after, they find themselves stranded on the island and under attack by unseen foes. One by one they meet violent ends.
Based on real events, the story follows a father and son (Offerman and Tremblay) who identify as Sovereign Citizens, a group of anti-government extremists, as they venture across the country and find themselves in a standoff with a chief of police (Dennis Quaid) that sets off an intense manhunt with tragic consequences.