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In the explosive conclusion of a two-part story arc that began with "Pandora," Castle and 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. In the episode, Jennifer Beals (The Chicago Code, Flashdance) continues as Sophia Conrad — a smart, commanding, and sexy CIA operative who was Castle's...

Check out these behind-the-scenes pics of Nathan Fillion, Stana Katic, and more on the set of "Linchpin," airing at 10 p.m. on Monday, February 20 on ABC.

Golden Globe nominee Shailene Woodley took some time from her hectic Awards Season scheudle to stop by the eBay Celebrity and Brad Pitt's Make It Right Celebrate Pop-Up Gallery Exhibition at Chelsea Market last night. The cutie actress sported a casual look, topped off by a stylish black leather bomber jacket.