A killer is disemboweling women, keeping them alive for a few hours, making them clean up after their injury, then killing them. The original victims were prostitutes, but the latest victim, Vanessa Holden, was from a wealthy and prominent family, hence her murder being a different victimology. And this latest murder took place one year after the previous, Vanessa picked up at a nightclub. With a different victimology, the BAU determined that the unsub also had changed over the previous year. Finding who would have helped him "change" would assist in finding the killer's pattern and new motivations, namely why he moved from prostitutes to women just out for a good time. Prentiss and Todd may have uncovered a key piece of of puzzle when they track who they suspect of being the killer's teacher. This case also tests the new working relationship between Todd and Hotch.