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.
Castle and Beckett investigate the bizarre murder of a young woman who was found ritually posed.
In "Dreamworld", Beckett races against time to find a stolen toxin capable of killing tens of thousands of people. To make matters worse, Castle was exposed, leaving him with less than 24 hours to live
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.
A guilt-ridden woman confesses to a murder, but contradictory evidence and a second confession complicate the case.
Castle and Beckett investigate the death of a young girl who appears to have been killed with telekinesis.
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.
In "Dressed to Kill," a young woman's murder sends Castle and Beckett into the world of cutthroat world of high-end fashion.
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.
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.