- The team investigates the death of a woman who hacked a law office for a specific file. It seems she thought her best friend was killed, and she was on a lead to that killer. Beckett interviews with the FBI.
- Castle is worried when Alexis insists on a Costa Rican exploration voyage with her lover, shocked to discover that Becket started applying for a Washington DC FBI task force behind his back. Still, he helps investigate the murder of Harvard honors student Erika Albrook. The team discovers she spent her nights as a hooker, or actually faked being one so she could hack a top law firm, so the question is for which of their many sensitive cases. Internet use analysis points to a firm dropout and several suspects who could know.—KGF Vissers
- The team open an investigation into the death of a young woman posing as a prostitute, and soon find themselves facing off against a powerful political dynasty with enough money to escape a murder conviction. Meanwhile, Beckett prepares to leave New York and join the Attorney General's office, but is forced to decide what she really wants in life when Castle proposes to her. In Castle 5×24 Watershed, In the season finale, an interview with a high-profile federal law enforcement agency forces Beckett to reconsider what she wants out of her job and out of her relationship with Castle. Meanwhile, the body of a young woman is found floating inside the water tank of a skid row flop house, but as the team investigate, they discover that her final resting place is just one of many strange things about her death.
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