Nathan Fillion as mystery writer Richard Castle is a treat. After killing off his best known character and experiencing writer's block, Castle joins forces with a reluctant Detective Kate Beckett, and her team, to solve true life murders. Castle's always responsible teen daughter, Alexis, and his intrusive but loving mother, Martha, round out the cast.

Nathan Fillion as mystery writer Richard Castle is a treat. After killing off his best known character and experiencing writer's block, Castle joins forces with a reluctant Detective Kate Beckett, and her team, to solve true life murders. Castle's always responsible teen daughter, Alexis, and his intrusive but loving mother, Martha, round out the cast.