The BAU heads to Lewiston, Maine, where two young women were murdered in separate incidents in their homes late at night, there being no sign of forced entry, and each woman stabbed 22 times in the abdomen. By the time the BAU arrives in Lewiston, there are two more victims, a husband and wife. Initial thoughts are that age may have something to do with victimology or that the abdomen stabbings may be associated with the women trying to get pregnant. But when J.J. and Lewis meet local ghost-chaser Courtney Mably, they may have stumbled onto the connection between the murders: that each victim lived in what locals believe are haunted houses, the unsub probably trying to cleanse the house of what he/she believes are infected souls. As arguably the most outwardly enthusiastic local who believes in such lore, Courtney -- who earns a living solely through her blog on the subject -- becomes the chief suspect. If Courtney is not the unsub, inserting herself into the investigation may place her life at risk at the hands of the actual murderer. Throughout this case, Rossi cannot help but be preoccupied by his near-death encounter with Everett Lynch, who is still at large, but who Prentiss believes will be caught eventually, but not at the rushed pace Rossi is trying to force.
—Huggo