Thirteen years since first encountering one of America's most notorious hate groups, award-winning film-maker Louis Theroux makes a long-anticipated return to Kansas to spend time with the Westboro Baptist Church - a hugely-controversial Christian ministry that for years has picketed at military funerals and other high-profile events with deliberately provocative and homophobic placards. Immersing himself in the strange world of Westboro, Louis explores what happens when a hate-group largely populated by one family loses its patriarch.