The Mormon church may have disavowed the polygamy it became so infamous for in the 19th century, but for some Fundamentalist Latter-Day Saints, "plural marriage" isn't just ancient history. Mormon bishop's wife Linda Wallheim couldn't be more surprised to learn that her son Kenneth is engaged. Kenneth has left the Mormon church, and met his fiancée, med student Naomi Carter, at a "Mormons Anonymous" meeting. Naomi was also raised Mormon—but her family belongs to a group that practices polygamy. Naomi's father, Stephen, invites the Wallheims to visit the family compound. Though Stephen and his five wives seem to live normal, modern lives, Linda can't shake the feeling that the family dynamics are off. When tensions on the compound escalate to murder, Linda delves into the many Carter family secrets to find the killer.