Richard "Rick" Castle is a millionaire playboy who recently killed off his main character when a serial killer starts killing people like he does in his books. He teams up with New York police detective Kate Beckett to solve the case. He finds inspiration in Detective Beckett and starts shadowing her for his next book.
She's armed, he's dangerous. (Season 2)
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Did You Know?
Castle makes multiple references to the Godfather Vito Corleone in the series, usually when the case is mob-related. See more
In many episodes detectives track somebody by using the entrance/exit information from their MetroCards. In NYC the card is only swept once at the entrance but not on the exit (except on Staten Island where card is swept at the exit only), so the person can travel almost the entire subway system with only the entrance recorded. Exit swipes are in use in Washington, DC and San Francisco's BART where zonal fares are in use. See more
[whatever Castle has done