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When the body of an infamous mobster who disappeared in the 1970s is found, Castle and Beckett find one remaining witness. But since he still believes it's the '70s, they must act like his delusion is real in order to find their killer.
When a Wall Street Trader is murdered the investigation is complicated when they find out the victim was a confidential informant for a US Attorney who happens to be Capt. Victoria Gates' estranged sister on Castle.
When Castle and Beckett investigate the murder of a Japanese ballet dancer, they realize that she may have be killed by a ninja, an now they're after Castle.
An undercover Narcotics operation goes wrong for Beckett and she ends up in a battle of wits with some of the most dangerous men of NYC's underworld on Castle.
When a woman confesses to murder, she tells the detectives details only the killer would know, but when someone else confesses with the same knowledge Castle and Beckett realize this case is more mysterious than they originally thought.
The murder of a high school mean girl brings Castle back to one of his many alma maters and face to face with a possible telekinetic killer on Castle.
The murder of a fashion icon's assistant brings to light unexpected obstacles for Rick and Kate's wedding on Castle.
The investigation into a pop star's murder uncovers her hard partying lifestyle but it's another unexpected revelation shocks everyone on Castle.
Castle is stunned when the murder of a former hacker leads directly back to his father, Jackson Hunt.
As serial arsonist's fire traps Ryan and Esposito, Jenny may end up giving birth alone on Castle.
When a dying man stumbles into a church before dying and hands a priest a baby, Castle and Beckett end up as unlikely nannies during their investigation into the man's death on Castle.
Castle and Beckett suspect a killer may be targeting members of the 12th precinct when a murder victim bears a shocking resemblance to Dr. Lanie Parish on the latest Castle.
On Castle, the detectives lives are on the line when a murder victim turns out to be a relationship therapist to powerful clients who are willing to kill to keep their secrets.
On Castle, Alexis asks her Rick for help when her Innocence Review case involves a man on death row. With only 72 hours to go, can father and daughter work together to prove his innocence...or is he truly guilty?
When a young woman is put into a ritualistic pose after being brutally murder, Castle thinks the symbols find in her apartment are part of a Da Vinci Code type conspiracy. Alexis and Pi move into their own place on Castle.
A murder suspect claims he's traveled back in time to save humanity. Kate, Rick and the team must determine if he's delusional killer, or telling the truth on Castle.
On Castle, a woman accused of murder takes hostages and insists she'll only speak with one person. Rick Castle.
The murder of a former teen star from a '90s high school sitcom takes a strange turn when Beckett and McCord arrive at the 12th to take over the case and find a new detective at Beckett's desk on Castle.
With Castle's life on the line and a stolen toxin threatening thousands of people, Beckett and McCord scramble to stop a terrorist attack and save Rick's life on Castle.
Will she or won't she? We learn Kate's response to Rick's major question on the Castle Season 6 premiere.