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The fourth season of , which aired on ABC from September 2011 to May 2012, is widely regarded as a pivotal turning point for the series. It balances the show's signature "murder-of-the-week" wit with a deeper, more serialized exploration of its central characters. Season Overview

It was a dark and stormy night in New York City, and Detective Richard Castle was sitting in his office, staring at a cold cup of coffee. Suddenly, his partner, Kate Beckett, burst in with a look of excitement on her face.