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Castle and Beckett investigate the murder of a man stuffed down a garbage shoot. Things get complicated when both his wife and fiance come in to identify the body.

Castle and Beckett investigate the murder of an Assistant District Attorney. Meanwhile, Alexis confides a secret to Beckett instead of her father.

After a bike messenger, carrying a package with content that is able to free a wrongly convicted man from pison, is brutally murdered, Castle and Beckett need to investigate the case. But they are surprised to find out that the tragic death is linked to another murder case previously investigated by Captain Montgomery. Now, in order to solve the new murder, Castle and Beckett must dig deep and discover all the secrets of a prominent New York family.

An up-and-coming rock star's body is found in a scene that appears staged from her recent music video.

As Halloween approaches, Castle and Beckett are called to a graveyard where the body of a young man sporting vampire fangs has been discovered with a wooden stake driven through his heart. Their investigation takes them deep into the heart of New York's underground vampire fetish community, where they learn that the motive for the victim's murder may be hiding within the pages of the graphic novel he was writing before his death.

Castle has a new book agent, Paula Haas, but she talks with him when he has gotten an opportunity that may change his career. The downside is that taking the opportunity would mean the end of his relationship with Beckett. Meanwhile, an unidentified woman is found dead in a manhole.

When an Arctic explorer is killed during a polar expedition, the mysterious circumstances of his death take Castle and Beckett from the penthouses of Park Avenue to the halls of the CIA. But Castle's delight at the case's many twists and turns soon turns to frustration as he realizes that their elusive killer might just be fooling them all.

It's fashion week and Castle and Beckett get to see what happens in the background as they investigate the murder of a model.

Castle and Beckett compete against Ryan and Esposito to see who can solve their murder case first. A few twists make the two teams work together to figure things out.

Castle has a lot going on. He's trying to finish his new novel Heat Wave and trying to figure out how to fix things with Beckett. They find themselves working together to solve the murder of a man found tangled in tree limbs.

Castle and Beckett investigate the murder of a missing plastic surgeon who is found dead in the front seat of his car after a week of being parked curbside. As they delve into the twisted world of surgery obsessed patients and secret operations, Castle experiences a fatherly rite of passage as Alexis attends her first prom. And while looking into Beckett's past, he unearths information that could end his relationship with her forever.

Castle contends with Beckett's ex-boyfriend, a handsome FBI agent investigating the disappearance of a little girl.

Castle and Beckett investigate the murder of a woman found drowned in a bathtub of motor oil at a transient hotel. After uncovering the woman's dark past, they must seek help from crime journalist who just may know more about the woman than he leds on. Meanwhile, Beckett puts her poker face to the test as she squares off against Castle, with her money and pride at stake.

Beckett and Castle investigate numerous cases involving murders and home invasion jewel heists.

Castle and Beckett look into the Vudon religion when an immigrant is found tortured in a ritualistic killing. Meanwhile on the homefront Castle must deal with the possible homecoming of Alexis' mother, his first wife.

A frozen woman is found tangled in steel bars at a construction site, leading Beckett and Castle to connect it to a cold case. As the two uncover facts about the victim's past, Beckett must face hard memories of her own, giving Castle insight and material for his novel.

The investigation behind a body found wrapped in a rug on the sidewalk leads Castle and Beckett deep inside the world of New York City politics. The partners discover a world of expensive escorts, arrogant tycoons, corrupt investigators, and the effects of betrayal.

When a teenaged boy whose family has recent fallen on hard times is found dead in a boat in Central Park, Castle and Beckett must piece together the mystery behind the boy's final moments. Meanwhile, Castle mulls over leaving Martha home while he chaperones Alexis' trip to Washington, D.C.

The investigation behind a body found wrapped in a rug on the sidewalk leads Castle and Beckett deep inside the world of New York City politics. The partners discover a world of expensive escorts, arrogant tycoons, corrupt investigators, and the effects of betrayal.

Mystery, Horror Novelist Richard Castle is questioned by police after two murders bear a strong resemblance to the murders in his novels. Later, Castle finds himself helping to investigate the crime displaying a unique insight into the true motivation of the killer. On the home front, Castle’s mother has moved in with him and his daughter Alexis. Both are concerned that he hasn’t been writing for some time and his publisher (and ex-wife) is putting on the pressure for his next novel.