Louis Theroux spends time with the Phelps family, the founders and members of Westboro Baptist Church in Topeka, Kansas, known for picketing military funerals and gay pride events with signs declaring God's hatred for homosexuals and America. Theroux moves into their orbit, talking with patriarch Fred Phelps, his daughter Shirley Phelps-Roper, and several of the church's teenagers and young adults who have grown up picketing since childhood. He joins them on protest lines, sits in on family meals and Bible study, and asks the questions an outsider would ask: why they believe what they believe, and what happens to members who leave or doubt. Theroux's approach stays even-tempered and curious rather than confrontational, which draws out moments where the family's certainty cracks, particularly among the younger members. The film builds toward an unresolved question about whether faith this absolute can survive contact with the outside world, or with its own children growing up inside it.