Exclusive: Castle Boss and Stana Katic Dish on Castle's First Muse

When Jennifer Beals comes to Castle as part of February sweeps two-parter, she will be more than just one of Rick Castle's old flames.

When Castle (Nathan Fillion) and Beckett (Stana Katic) discover a murder victim who was apparently murdered by a rogue CIA agent, they quickly find themselves in the middle of a much larger investigation, led by Beals' Sophia Conrad.

"She is a CIA agent and, as we know, in Richard Castle's first series of books, a female CIA agent figured prominently," creator and executive producer Andrew W. Marlowe tells TVGuide.com. "So, of course, it would lead us to ask: Is Beckett Castle's first muse?"

Naturally, Beckett learning that she isn't Castle's first will leave Beckett with lots of questions about the will-they-won't-they couple's future...



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