Filmmaker Dan Murdoch meets the leaders of the Loyal White Knights, who claim to be the largest Klan chapter, to witness first-hand their secretive rituals and hear about why their members choose to don the hood. Klansmen say 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, he crystallises the danger of the white supremacist ideology.