“To the Boy In the Blue Knit Cap” is the eighth and final episode of the tenth season of the American police procedural television drama series Law & Order: Criminal Intent. This episode is the final episode of the series. It first aired in the United States on the USA Network on June 26, 2011. In this episode, detectives Robert Goren and Alexandra Eames investigate a case centered around Parker and Thomas Gaffney, a set of wealthy twins, who file a lawsuit against a social networking site due to allegations of stealing copyright claims.

“To the Boy In the Blue Knit Cap” was written by Julie Martin and Chris Brancato, although uncredited, it was extensively re-written by René Balcer with Warren Leight writing the final scene of the episode, and it was directed by Jean de Segonzac. The story and the characters in the episode were highly influenced by the real-life lawsuit against Facebook made by Tyler Winklevoss and his brother Cameron Winklevoss, as well as the film adaption to the event, The Social Network. Critics reacted to the episode with mixed reception upon airing, with much criticism stemming from the cultural references and the episodic plot. Upon its original airing, “To the Boy In the Blue Knit Cap” was watched by 3.75 million viewers, and it achieved a 0.9 rating in the 18-49 demographic according to the Nielson ratings. It featured guest appearances by James Van Der Beek, Thad Luckinbill, Trent Luckinbill, and James Brandon.