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An entertainer on a cruise ship is killed, and Castle and Beckett investigate while trapped on the ship with the murderer.
A seductive con man is killed, and the investigation has Castle and Beckett questioning New York City's upper crust. Meanwhile, Castle has a surprise in store for his and Beckett's one-year anniversary as husband and wife.
Det. Slaughter returns seeking Castle's help in a robbery case. However, Slaughter becomes a suspect when the heist case turns into a murder case, and Castle's unsure about whether his pal is innocent or guilty.
An art thief steals a rare painting and kills the person transporting it, so Castle and Beckett team up with the key witness in order to find the culprit.
A hermit-like author idolized by Castle is killed, and Castle resolves to solve the murder.
Castle goes undercover as a professor after a college fraternity student is killed in a grisly manner. During the investigation, he and Beckett unearth some sinister secrets the university wants to keep suppressed.
In the conclusion of the eighth-season opener, Beckett's disappearance is examined from her angle as she fights to stay alive and uncover who wants to see her demise.
Since passing her Captain's exam and the offer to run for State Senate, Beckett and Castle are adjusting to her career change. A call from a mysterious stranger sets off an unpredictable chain of events.