The young rising star of "The Wives of Wall Street" is murdered; Castle tries to give Beckett a Valentine's Day gift, but his plans go awry.
Castle and Beckett discover evidence that links a young woman's murder to Sen. William H. Bracken (Jack Coleman) -- the man responsible for the murder of Beckett's mother; Beckett faces complications as she tries to finally bring Bracken to justice.
When the founder of an adult video franchise is murdered, Beckett and Castle are faced with a lengthy list of suspects; Castle is upset when Alexis starts a revealing video blog.
Castle and Beckett are thrust into New York's raucous music industry as they investigate the murder of an up-and-coming DJ; Esposito takes a troubled teen under his wing.
Several angry ex-husbands come under suspicion when a divorce attorney who only represented women is murdered; when Alexis gets sick, Castle's ex-wife moves into the loft to take care of her.
The team must solve a case involving a dead Santa who falls from the sky and lands in Central Park. Castle and Beckett celebrate their first Christmas together.
While retrieving a murder witness, Castle and Beckett are ambushed, forcing them to take the witness on the run.
A documentary crew follows Castle, Beckett and the team as they investigate the murder of a rock band's lead guitarist.
As Beckett and Castle investigate a murder at a sci-fi convention, they encounter avid fans in costume, egotistical celebrities and a lot of drama.
The investigation into a ritualistic murder turns up evidence linking Castle to the crime, leading Beckett to wonder how well she really knows him.
Castle's plans with Beckett are disrupted when a dying man stumbles into his backyard and collapses in his pool.
When a woman is murdered, Castle and Beckett think a repossessed storage unit may have a connection to her death.
On Beckett's first day back from suspension, she and Castle investigate a weathercaster's death, and try to hide their relationship from their co-workers.
Castle and Beckett set aside questions about their relationship in order to take on the forces responsible for Beckett's mother's murder.
Castle tries to protect Beckett as she pursues the man who shot her; the 12th precinct is forever changed as feelings and secrets are revealed.
When a dead man is found with human bite marks on his body, a witness claims the deceased was attacked by a zombie.
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