Watershed - FINALE
Season 5, Ep. 24
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.
Read more: 'Castle' finale: It might not be happily-ever-after for Castle and Beckett
Gallery: Nathan Fillion: The king of 'Castle'
First aired on May 13, 2013.
The Human Factor
Season 5, Ep. 23
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.
Read more: The master of hijinx himself gets pranked by Beckett (again!)
Gallery: The many faces of (stunning!) Stana Katic
First Aired: May 6, 2013
Season 5, Ep. 22
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.
First Aired: April 29, 2013
The Squab and the Quail
Season 5, Ep. 21
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.
First Aired: April 22, 2013
The Fast and the Furriest
Season 5, Ep. 20
Beckett and Castle discover giant footprints at the site of a vicious murder, leading the team to wonder if Bigfoot is the killer.
Read more: It's Castle vs. Big Foot...and Castle vs. Beckett's skepticism
Gallery: 'Castle' cases worth writing about
First Aired: April 15, 2013
The Lives of Others
Season 5, Ep. 19
While stuck at home with a broken leg, Castle believes he witnesses a murder in the apartment across the street.
Read more: The 100th episode has a Hitchcock homage with housebound Castle witnessing a murder
First Aired: April 1, 2013
The Wild Rover
Season 5, Ep. 18
When a body is discovered in an industrial cake mixer, the murder is traced to an Irish gang and a bar owner named Siobhan O'Doul (Cara Buono); Detective Ryan reveals a history with Siobhan from his time working under cover in narcotics.
Read more: Nathan Fillion promises Det. Ryan's secret past will be revealed
First Aired: March 25, 2013
Scared to Death
Season 5, Ep. 17
Castle and Beckett tackle one of their creepiest cases yet when a woman appears to have been scared to death by a "haunted" DVD; Castle fears for his life after he accidentally watches the video.
Read more: Things get terrifying with a guest appearance by horror movie director Wes Craven
First Aired: March 18, 2013
Season 5, Ep. 16
After the FBI fails to get Alexis back, Castle takes matters into his own hands; Castle learns that his daughter's kidnapping may be a part of a larger and more sinister agenda.
Read more: A world-wide search for Alexis and the emergence of Castle's dad
Gallery: Castle is the best dad on TV
First aired on February 25, 2013.
Season 5, Ep. 15
A murder investigation reveals a plot to kidnap a wealthy businessman's daughter; FBI Agent Harris (Dylan Walsh) helps Castle and Beckett investigate.
Read More: Castle’s worst nightmare comes true and the #SaveAlexis hashtag says it all
First aired on February 18, 2013.
Reality Star Struck
Season 5, Ep. 14
Castle tries to give Beckett a Valentine's Day gift, but his plans go awry as a young rising star of "The Wives of Wall Street" is murdered.
Read More: Castle’s Valentine’s Day plans for Beckett are thwarted
View: 'Castle's' most romantic moments
First aired on February 11, 2013.
Season 5, Ep. 13
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.
Read: An extra episode announced and rumours of an unexpected family reunion
Photo gallery: Check out how the cast has changed over the seasons
First aired on February 4, 2013.
Under the Influence
Season 5, Ep. 11
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.
First aired on January 14, 2013.
Season 5, Ep. 10
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.
First aired on January 7, 2013.
Season 5, Ep. 9
Castle and Beckett investigate when a bearded man named Kriss Kringle falls from the sky in Central Park; Beckett and Castle work on a Christmas list together.
First aired on December 3, 2012.
Season 5, Ep. 8
While retrieving a murder witness, Castle and Beckett are ambushed, forcing them to take the witness on the run
First aired on Nov. 19, 2012.
Season 5, Ep. 7
A documentary crew follows Castle, Beckett and the team as they investigate the murder of a rock band's lead guitarist.
First aired on November 12, 2012.
The Final Frontier
Season 5, Ep. 6
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.
First aired on November 5, 2012.
Season 5, Ep. 5
While investigating a shocking ritualistic murder, Beckett and her team uncover surprising evidence linking Castle to the killing. As the evidence against him mounts, loyalties are tested, and when surprising revelations come to light, Beckett begins to wonder how well she really knows her new lover and partner of four years.
First aired on October 29, 2012.
Murder, He Wrote
Season 5, Ep. 4
Castle and Beckett's plans for a romantic weekend in the Hamptons are interrupted when a dying man stumbles into Castle's backyard, collapsing into his pool. Unable to escape the lure of the investigation they join up with the small town's well-intentioned, but inexperienced sheriff to find the killer.
First aired on October 15, 2012.
Secret's Safe With Me
Season 5, Ep. 3
When a woman is murdered, Castle and Beckett think a repossessed storage unit may have a connection to her death.
First aired on October 8, 2012.
Cloudy with a Chance of Murder
Season 5, Ep. 2
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.
First aired on October 1, 2012.
After the Storm
Season 5, Ep. 1
Castle and Beckett set aside questions about their relationship in order to take on the forces responsible for the murder of Beckett's mother.
First aired Monday, September 24, 2012.
Always - Season Finale
Season 4, Ep. 23
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.
First aired on May 7, 2012.
Season 4, Ep. 22
When a dead man is found with human bite marks on his body, a witness claims the deceased was attacked by a zombie.
First aired on April 30, 2012.