CASTLE: Photos from “Linchpin”

In the explosive conclusion of a two-part story arc that begins Monday, February 13th with “Pandora,” Castle& Beckett race to find the “Linchpin” in order to stop the first domino in a chain of events which will plunge the United States into war, on “Castle,” MONDAY, FEBRUARY 20 (10:01-11:00 p.m., ET), on the ABC. In the episode, Jennifer Beals (“The Chicago Code,” “Flashdance”) continues as Sophia Conrad – a smart, commanding and sexy CIA operative who was Castle’s inspiration for Clara Strike in the Derrick Storm series of books — and Josh Stamberg (“Drop Dead Diva”) is back as intelligence officer Martin Danberg. (ABC)