Castle Season 4, Episode 14, “The Blue Butterfly”: Which Character Says “Hold Your Tongue or I’ll Cut It Out”?!

We already know Seamus Dever will be exploring his Celtic roots as a "tough-ass guy with an Irish accent" on Monday’s 1940s-themed Castle episode, "The Blue Butterfly," but Seamus and his co-star Jon Huertas spilled some more about their "tough thug" alter egos, the cast’s authentic costume pieces, and beating up ABC’s favorite witty detective."It’s really exciting to see Nathan Fillion play this 1940s-esque private eye, he does...


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