In this episode, Detectives Robert Goren and Alexandra Eames investigate a case centered on Parker and Thomas Gaffney, 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), and was extensively rewritten by René Balcer, with Warren Leight writing the final scene of the episode, and it was directed by Jean de Segonzac.

Goren and Eames investigate when the bodies of twins Parker and Thomas Gaffney are found in the offices of popular dating website Kizmate.

Danielle claims the algorithm used on the site was one she devised herself after she met PJ and was trying to track him down, leaving a message for "the boy in the blue knit cap".

Hildy, Danielle's assistant, tells Goren and Eames she did not give her card to anyone and becomes huffy when the detectives press.

Meanwhile, one of the computer techs at Major Case discovers Danielle used the same algorithm for Kizmate as she did for the Gaffneys' site.

Rex shows them a picture from a hidden camera in the office, and they notice a blue knit cap covered the lens.

Gyson insists that he will do fine, but Goren returns the cards and requests another session with her next week, to which she agrees.

The episode ends as Goren leaves Gyson's office and seems surprised to find that Eames awaits him on the street, standing outside of her familiar black SUV.

"To the Boy in the Blue Knit Cap" was directed by Jean de Segonzac, in his third episode of the season.

"To the Boy in the Blue Knit Cap" was co-written by Julie Martin and Chris Brancato, and rewritten extensively by the series' creator René Balcer, with the final scenes written by former show runner Warren Leight.

[2][3] Dick Wolf, the creator of the Law & Order franchise, served as the executive producer for the episode alongside Brancato and Peter Jankowski.

[1][5] Thad and Trent Luckinbill made an appearance on the episode, playing the roles of Thomas and Parker Gaffney, wealthy twins.

[7] "To the Boy In the Blue Knit Cap" features several references relating to music, film, literature, and other pop-culture phenomena.

In a nod to the creation of Facebook, or at least as it was portrayed in the movie The Social Network, Goren and Eames are called into the offices of a social-networking site, an online matchmaking service.

"To the Boy in the Blue Knit Cap" first aired on June 26, 2011, in the United States on the USA Network.

Nelson exclaimed that the episode was "downright unemotional", and expressed that "beyond the step-by-step as we follow Goren and Eames through the clues, there isn't much in the way of hints that this is [...] a series finale.