Film-maker Dan Murdoch meets the leaders of the Loyal White Knights, who claim to be the largest Klan chapter with "boots in every state", to witness first-hand their secretive rituals and hear about why their members choose to wear the infamous hood.
The Klan says they are not violent. But, when a 21-year-old white man walks into a church in Charleston, South Carolina, and massacres nine black worshippers saying he wants to start a race war, the danger of the white supremacist ideology becomes a terrifying reality.
In the course of his investigation, Dan meets a new Klan recruit who'd been a roofer for 20 years until, he claims, Mexicans took his job. Unemployed, he feels squeezed out the job market by immigrants undercutting him on wages and thinks an America run by the Klan would help protect him.
What Dan discovers is a group divided in its ideology and aims. Whilst some have revolutionary ideas about overthrowing the political and banking systems, others want the option for all-white churches and businesses and the right to send their children to all-white schools if they wish.
The film follows events as protests erupt and Black Power groups, including the New Black Panthers, take to the streets to preach their own agenda of black supremacy. And when the Ku Klux Klan and the New Black Panthers organise rival protests in the South Carolina capital, the two extreme visions of America come violently face-to-face.