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.

When a two-year-old girl is discovered missing from her home, Beckett is called in to assist with the investigation only to discover that the FBI agent in charge is, in fact, her ex-boyfriend. The two of them try to put aside their unresolved feelings as they race to find the girl, but when Castle inserts himself into the investigation, competition quickly heats up for Beckett's attention.

Castle and Beckett investigate the murder of a woman found drowned in a bathtub of motor oil at a transient hotel. But when they uncover a dark secret about the woman's past, they must unravel a 20-year-old mystery with the help of a true crime journalist who may have been stalking the victim. Meanwhile, Beckett puts her poker face to the test as she squares off against Castle, with her money and pride at stake.

When a string of high-end home invasions end in murder, Castle and Beckett must determine who is orchestrating these violent robberies before they strike again. But to catch this deadly thief, Beckett must go way out of her comfort zone to enter Castle's glamorous, paparazzi filled world as his date to a charity ball. Meanwhile, Castle seeks the counsel of a dangerous ex-jewel thief who had once threatened to kill him.

When an immigrant is found tortured and murdered in a ritualistic killing, Beckett navigates the uncharted territory of the mysterious Vodun religion with Castle leading the way. Having researched similar deaths for one of his books, Castle's knowledge and sources prove valuable, but only their apt teamwork can unravel the murderer's motives. Meanwhile, Castle is confronted with the possible return of his first wife, Alexis's mother, whose dizzying personality threatens to upend the tranquility of the entire family.

Frozen woman found tangled in steel bars at a construction site leads Castle and Beckett to a years-old mystery and a long abandoned case. As the two uncover startling revelations about the victim's past, the investigation forces Beckett to face some difficult memories of her own, which provides Castle insight into his muse and additional material for his novel.

When the dead body of a New York City Councilman running for re-election rolls out of a rug and into Beckett's case files, she and Castle are thrown into the world of dirty politics. Meanwhile, Castle's final novel in the Derrick Storm series hits the bookstores, causing his mother to search for any and all signs of failure. And at one of his book readings, Beckett tries to throw Castle off his game, only to learn that he has flipped the script on her once again.

Once wealthy teenage boy whose family has fallen on hard times is found dead in a rowboat floating along the lake in Central Park. As Castle and Beckett try to piece together the events leading up to his death, his friends do everything in their power to thwart the investigation. As they unravel the truth from the lies, a story of betrayal and obsession emerges. Meanwhile, Castle debates whether he can leave Martha home alone while he chaperones Alexis' class trip to Washington, DC. Martha might be an aspiring "Life Coach," but that doesn't mean she's trustworthy.

The body of a young woman is found spinning inside the dryer in the laundry room of an upscale apartment building. When Castle and Beckett discover that the woman, in her 20s, worked as a Nanny in the building, their investigation leads them to a world of sex, lies and "playdates." Meanwhile, while writing the first novel to his "Nikki Heat" series, Castle delves into the thoughts and actions of Beckett, as she navigates the murder case while revealing more of her own mysteries.

A wildly famous mystery novelist, Richard Castle, who is bored with his own success, learns that a real-world copycat killer has started staging murders from scenes depicted in his novels. Castle is questioned by NYPD Detective Kate Beckett, a bright and aggressive detective who keeps her investigations under a tight rein. Though they instantly clash, sparks of another sort also begin to fly, leading both to danger and a hint of romance as Castle steps in to help find the killer.