The team heads off to investigate the death of people posting personal information on blogs on Criminal Minds. "The Gathering" is the 17th episode of the show's ninth season.
Unsub: You should be honored that I chose your stories. I did everything that you described, down to the smallest detail. Peter: Uh huh. I see. That's where you're wrong. Unsub: What are you talking about? Peter: There's one detail you got wrong. I never cared bout the tongue. That was you.