"Masterpiece" is the eighth episode of Season Four and the 73rd overall of Criminal Minds.
When a narcissistic psychopath confesses he has killed seven people and more will die, the team must locate his latest victims before it is too late.
- David Rossi: "Let us consider that we are all insane. It will explain us to each other. It will unriddle many riddles." – Mark Twain
- David Rossi: "Man must evolve for all human conflict a method which rejects revenge, aggression, and retaliation. The foundation of such a method is love." – Martin Luther King, Jr.
- Paul Michael Glaser's portrayal of Detective Garrity in the episode marks the only time a director for a Criminal Minds episode has appeared in his own episode (outside of Matthew Gray Gubler, Thomas Gibson, Joe Mantegna, Aisha Tyler, Adam Rodriguez, and AJ Cook appearing as Reid, Hotch, Rossi, Lewis, Alvez, and JJ, respectively, in the episodes they directed).
- The poster seen in this episode later reappears in Brandon Slade's room in "Painless".