VIDEO: Sneak Peek - CRIMINAL MINDS' 'The Lesson,' Airing 12/5

Check out a sneak peek of CRIMINAL MINDS episode "The Lesson," airing tomorrow night on CBS!

"The Lesson" – The BAU investigates a series of male bodies that have been oddly disposed of, finding themselves in search of a killer with ritualistic tendencies. Also, Reid gets anxious when faced with the possibility of meeting his mystery woman, on CRIMINAL MINDS, Wednesday, Dec. 5 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Series star Matthew Gray Gubler directs the episode.