Castle Origins: Ryan's beginning

Castle Origins: Ryan's beginning

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WpMetadataNoticeLast published Tue, Aug 25, 2026
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Fanfic
Original Character (OC)
TV Show
Mystery
Detective and Police
Castle Origins: Ryan's Beginning Nine years before bestselling author Richard Castle ever stepped foot inside the Twelfth Precinct, Kevin Ryan was just another rookie trying to survive his first day on the job. Fresh out of the NYPD Academy, twenty-two-year-old Ryan is assigned to the Twenty-Third Precinct and partnered with veteran Training Officer Daniel Cross-a hard-nosed cop who believes mistakes are lessons, not excuses. Between missing children, lonely welfare checks, dangerous robberies, and the pressure of proving he belongs, Ryan quickly learns that the academy taught him how to be a police officer... but the streets will teach him how to become one. Follow Kevin Ryan's journey from nervous rookie to the detective we meet in Castle. Along the way, he'll forge lifelong friendships, make heartbreaking mistakes, face impossible choices, and discover that sometimes the smallest moments shape a career more than the biggest cases ever could. Before the Twelfth. Before Castle. Before Beckett. This is where Kevin Ryan's story begins. Warning: this story is likely to include a little more mature content later in the book when Ryan becomes a narcotics cop, plus there is some romance. Most of it isn't explicit but I can't guarantee it will stay that way. I'd recommend 13+
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