Castle grows bored because he's stuck at home with a broken leg, but things get interesting when he witnesses a murder in an apartment across the street.
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A murder investigation leads to an Irish crime family Ryan knows from his days as an undercover cop, so he steps back into his old role to help solve the case, complicating his relationship with his wife in the process.
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A DVD is thought to be haunted when people start to die after viewing it, and when Castle mistakenly watches the DVD, he fears for his own safety.
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Hunt
Season 5, Episode 16
Conclusion. Castle seeks assistance from a shady individual to rescue Alexis after the FBI proves unsuccessful, and he learns that his daughter's abduction is possibly tied to something more disastrous than he first realized.
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Target
Season 5, Episode 15
Part 1 of 2. Castle and Beckett's homicide case exposes a kidnapping plan centered on the daughter of a rich businessman from the Middle East.
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Castle and Beckett investigate the homicide of an emerging reality star who was part of the cast of "The Wives of Wall Street." Meanwhile, Castle runs into trouble as he searches for a Valentine's Day present for Beckett.
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Recoil
Season 5, Episode 13
Castle and Beckett discover evidence that links a senator to a young woman's murder.
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The founder of an adult-video franchise featuring college coeds is killed, so Castle and Beckett probe his personal life to uncover clues about his murderer. Meanwhile, Castle disapproves of Alexis' new video blog, fearing she's exposing too much info about her private life.
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A promising DJ is murdered at an album-release party for a fading pop star, and the investigation takes Castle and Beckett inside the city's music industry. One lead points to a troubled teen, whom Esposito tries to put on the right path.
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Castle and Beckett investigate a divorce attorney's homicide and compile a long suspect list full of angry ex-spouses. Meanwhile, Alexis' mom nurses her ill daughter back to health at the loft, where Beckett is also bunking while her place is fumigated.
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A man resembling Santa Claus is found dead in Central Park, and Castle and Beckett uncover some unsavory things about him as they investigate his murder. Meanwhile, Castle and Beckett prepare to celebrate their first Christmas as a couple.
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Castle and Beckett must go on the run with a murder witness they're protecting from the mob, and because they had to move quickly, they find themselves unarmed and stranded with no phone in the middle of the night.
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Swan Song
Season 5, Episode 7
Castle and Beckett investigate the murder of a rock star who was being filmed by a documentary crew, and the film crew decide to keep their cameras rolling and record some crime-solving skills in action.
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A homicide occurs at a sci-fi convention, forcing Castle and Beckett to deal with zealous fans and pompous celebrities as they investigate the crime.
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Castle becomes the prime suspect in a ritualistic killing, and Beckett's loyalty toward him wavers in the face of mounting evidence.
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Castle and Beckett head to the Hamptons for a romantic getaway, but their plans go awry when a man dies in Castle's pool and they assist the small-town police with the ensuing homicide investigation.
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Castle and Beckett look into the auction of a storage unit, which may be tied to a woman's murder, and soon they find themselves mingling with both treasure hunters and socialites.
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Beckett returns from her suspension and joins Castle in investigating the death of a local TV weather forecaster. Meanwhile, she and Castle try to keep their new romance a secret at work.
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In the Season 5 opener, a night of passion forces Castle and Beckett to reexamine their relationship. Meanwhile, they must go up against the people who murdered Beckett's mother and are now threatening Beckett's life; and Beckett clashes with a senator.
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