A crime drama set in New York City, the first episode of Castle aired on ABC in 2009. Mystery novelist Richard Castle becomes a regular consultant for the NYPD after they question him about a crime that is similar to a murder in one of his books. He works closely with Homicide Detective Kate Beckett. Richard has been divorced twice, and he shares an apartment with his mother Martha and his teenage daughter Alexis, who sometimes offer insight into crimes that Richard and Kate solve together. You can watch Castle online if you miss an episode and read the summaries below to catch up before the new season starts.