Matt and Emily take on the case of Warren Keegan, a polygamous cult leader whose fanatical ways have earned him a place on the Ten Most Wanted list. When one of Warren's daughters, Darah, attempts to escape the cult, Warren and his wives abduct her in his motor home before she can reach freedom. Matt and Emily track Warren as he flees with Darah and his wives, and they attempt to pinpoint where he might be driving them. With help from one of Warren's former wives who had successfully left the cult, Matt and Emily learn that Warren believes he will survive the apocalypse only if he dies with four wives by his side. As the team attempts to save Darah and the other women, Matt discovers an even deeper plot for revenge, which could lead to more casualties than they had first thought. In order to save the women's lives and possibly hundreds of others, Matt and Emily know they must first dissolve their unremitting allegiance to Warren.