Mormon bishop's wife Linda Wallheim is stunned to learn her son Kenneth has gotten engaged to a young woman from a polygamous family. Naomi Carter may have left the religion she grew up in, but the Carters will still be the Wallheims' in-laws once Kenneth and Naomi are married. Stephen Carter, Naomi's father and the patriarch of the Carter clan, invites the Wallheims over to the Carter family compound in the remote foothills of the mountains outside Salt Lake City. Stephen Carter wishes to extend an olive branch to his future in-laws, and introduce them to his five wives and twenty-two children. Linda has her eyes peeled for signs that Stephen's wives and children are unhappy or abused. Although she can't find concrete evidence of mistreatment, Linda's gut instinct tells her that something on the Carter family compound is deeply wrong. She can't quite put her finger on what -- until it's too late, and one of the family members is found murdered.