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As one of the few procedural shows on ABC, the idea of a spin-off focusing on crime-solving fits neatly within the network's programming framework. Procedurals often attract a loyal audience, as they provide a structured format that audiences can rely on week after week. With a proven concept on Castle, a spin-off featuring Ryan and Esposito could easily replicate the thrilling crime-solving adventures that fans love, yet bring fresh narratives and character development to the forefront.