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| A manhunt is launched for professional hitman, Hal Lockwood, after he escapes during a court hearing. Lockwood possesses information about the murder of Beckett's mother. As the hunt proceeds, Castle and the team find there's someone with connections to law enforcement who's linked both to the death of Johanna Beckett and to Lockwood's escape. The season finale leads to a highly emotional and deadly conclusion with the search for Lockwood and his co-conspirator. |
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| Castle and Beckett investigate the murder of a contestant in a beauty pageant "Miss Illinois", found strangled during the rehearsal for "Baron's All-American Beauty Pageant". As the investigation goes on, they find out that several people had motive to kill the victim. |
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| Beckett goes rogue to pursue a suspect in her former partner's murder in Los Angeles. Castle tags along, and the two visit the set of his movie, "Heat Wave," where the cast proves helpful in breaking open the case. |
