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.

Criminal Minds Season 8 Episode 17 Quotes

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.

Oscar Wilde said "I can resist anything but temptation."