At the World Peace and Unification Sanctuary, God's kingdom on Earth can only be attained through a well armed militia. Based in Pennsylvania, this small church glories in the queasy connections between God and guns. In the wake of the Parkland massacre and other related horrors, the church has garnered intense scrutiny as a potentially damaging fringe cult. The filmmakers behind Iron Kingdom embed themselves with the group's leaders and followers to learn the truths behind their unusual worldviews.