Rick Castle is one of the world's most successful crime authors. He is asked to consult with the New York City police about a serial-killer case in which the murderer is reenacting scenes from Castle's books. Beckett, an avid reader of Castle's books, initially disapproves of having Castle shadow her work, but later warms up and recognizes Castle as a useful resource in her team's investigations.
Fillion's performance is top-notch and his character's off-key relationship with his mother and daughter adds a charming element to the series that makes it more than the usual police procedural.
