During the Halloween season as Garcia prepares for a Day of the Dead celebration at her apartment for the team, the BAU is called to Provo, Utah to investigate the murder of a Jane Doe, whose dead body was crushed beyond recognition beneath a pile of boulders in a state park outside of the city. The woman, who is eventually identified as Gloria Carlyle, had deep lacerations on her arms, a burn mark on her body, and all material embellishments removed from her person. Her recent past included leaving a Utopian sect three months earlier, that sect which was involved in a similar mysterious death five years ago. The team finds another dead body shortly after their arrival, the similarities being that the victim is young, female and blond. A third victim initially confuses the team as it is a he, who was morally perverse. It is that latter issue and the similar burn mark found on his body - which the team will eventually learn is a brand - that may provide the nature of the ritual involved and the identity of the unsub.