When viewers first met Richard Castle, a famous mystery novelist, he was creatively blocked. But when the NYPD questioned him in connection with a series of murders staged to imitate crime scenes from his books, Castle found inspiration in NYPD Detective Kate Beckett. Once that initial case was solved, Castle and Beckett continued to investigate strange homicides in New York, combining Castle’s writer intuition and Beckett's creative detective work. In the Season 7 finale, Beckett was faced with a choice about her future. Now that she's been promoted to Captain, how will New York's famous couple adapt in Season 8?
Castle and Beckett set aside questions about their relationship in order to take on the forces responsible for Beckett's mother's murder.
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.
When a woman is murdered, Castle and Beckett think a repossessed storage unit may have a connection to her death.
Castle's plans with Beckett are disrupted when a dying man stumbles into his backyard and collapses in his pool.
The investigation into a ritualistic murder turns up evidence linking Castle to the crime, leading Beckett to wonder how well she really knows him.
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.
A documentary crew follows Castle, Beckett and the team as they investigate the murder of a rock band's lead guitarist.
While retrieving a murder witness, Castle and Beckett are ambushed, forcing them to take the witness on the run.
Castle and Beckett investigate when a bearded man named Kris Kringle falls from the sky in Central Park; Beckett and Castle work on a Christmas list together.
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.
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.
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 discover evidence that links a young woman's murder to Sen. William H. Bracken -- the man responsible for the murder of Beckett's mother; Beckett faces complications as she tries to finally bring Bracken to justice.
Castle & Beckett get an up-close-and-personal view of a "Real Housewives"-esque reality TV series, "The Wives of Wall Street," when they investigate the murder of the show's rising young star. Meanwhile, Castle's attempt to give Beckett a Valentine's Day gift goes horribly wrong.
Castle and Beckett team up with the FBI when a murder investigation reveals a plot to kidnap a wealthy businessman's daughter -- and Alexis!
When a young woman appears to have literally been scared to death three days after watching a “haunted” DVD, Castle and Beckett delve into one of their creepiest cases yet. To make matters worse, Castle becomes convinced that he too is marked for death when he accidentally watches the cursed video. Master of horror Wes Craven makes a special guest appearance!
When a man is found dead in an industrial cake mixer, Castle and Beckett trace the murder to an Irish gang in Staten Island and a beautiful bar owner named Siobhan O'Doul (guest star Cara Buono, "Mad Men"). Much to everyone's surprise, Detective Ryan has a complicated history with Siobhan from his days working undercover in narcotics. Ryan must go back undercover to expose the killer.
Beckett and Castle discover giant footprints at the site of a vicious murder, leading the team to wonder if Bigfoot is the killer.
When Beckett is tasked with protecting a charming billionaire whose life is in danger, she reflects on her relationship with Castle; consumed with jealousy, Castle tries to solve the case as quickly as possible.
When Beckett steps on a pressure-sensitive bomb, the team searches for a way to save her while Castle distracts her by talking about their relationship.
When a government whistleblower is murdered, Beckett and Castle must figure out who is responsible and determine why Homeland Security is trying to take over the case.
An interview with a federal law enforcement agency forces Beckett to reconsider her career and her relationship with Castle; a young woman's body is found inside a flop house's water tank.