Alexis enlists Castle's help on an Innocence Review case to prove that a death row inmate, Frank Henson (guest star James Carpinello, "The Good Wife"), was wrongly convicted.
Castle and Beckett investigate the bizarre murder of a young woman who was found ritually posed.
When an up-and-coming professional skateboarder is gunned down by a mysterious motorcyclist, Castle and Beckett are thrust into the world of extreme sports, where the death defying stunts aren’t the only thing that’s dangerous.
A bleeding man stumbles into a church, but just before dying, he hands a mysterious bundle to the priest. When the bundle turns out to be a smiling baby boy, Castle and Beckett find themselves accidental nannies to the newborn.
When a famed relationship therapist is murdered, it appears that her access to the secrets of her elite and powerful clients led to her death.
Castle and Beckett discover that the victim of a building fire was actually shot to death, they get on the trail of a serial arsonist turned murderer. Meanwhile, Ryan’s wife, Jenny, goes into labor, but disaster threatens to ruin the joyous moment.
A secret investigation conducted by Beckett related to her mother’s murder goes awry when a man she has been surveilling is killed. When evidence links Beckett to the victim, she and Castle become the targets of a manhunt that puts both of them in grave danger.
In "Limelight," Castle and Beckett investigate the murder of a young woman.
The murder of a young video store clerk takes a strange turn when the team discovers his past history as a high-level hacker. But it’s nothing compared to the shock Castle receives when their investigation leads them straight to his father, Jackson Hunt.
A guilt-ridden woman confesses to a murder, but contradictory evidence and a second confession complicate the case.