Leslie (Amy Poehler) enlists the help of Dave (guest star Louis C.K.) and Andy (Chris Pratt) in order to catch a local teen vandal. Meanwhile, Ann (Rashida Jones) struggles to make her Halloween party fun, and gets help from an unlikely source. Aziz Ansari, Nick Offerman and Aubrey Plaza also guest star.
When Meemaw is pursued by two gentlemen callers (guest stars RICHARD KIND and WALLACE SHAWN), Sheldon interferes, forcing her to set some ground rules on the season finale.
Castle and Beckett get an inside look at the cutthroat world of the New York fashion industry when they investigate the brutal murder of a young model during Fashion Week.
When sniper-on-the-loose Jacob Broadsky (guest star Arnold Vosloo) claims another victim, Booth becomes more determined than ever to catch his elusive foe. After a bullet meant for Booth strikes an innocent victim, Booth makes it his mission to catch Broadsky once and for all.
As the BAU investigates targeted killings in Tampa, they also deal with their own feelings about the loss of Prentiss.
