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World famous mystery writer Richard Castle finds unexpected inspiration when Detective Kate Beckett questions him about a series of murders that based on his books.
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.