With Blake deciding to return to Boston to teach full-time and Prentiss declining the request to return, Hotch is interviewing for the vacancy on the team. Who he hires is a known entity to the team, namely Kate Callahan. Her first case working for the BAU takes them to Bakersfield, California, where three human torsos have been found in deserted locales within the past month - one male and two females. The medical examiner is able to determine that the limbs were removed with precision, that the victims had leather in their digestive tract, that they were kept alive up to 48 hours after the limb removal and the torsos had been preserved. The team soon discovers that the unsub has sold some of the limbs on the black market. Those sales and the identities of the victims may provide some clues as to the unsub's identity and location.