A sexy insurance investigator -Kristin Lehman- with a secret helps Castle and Beckett when a valuable sculpture is stolen and someone is murdered.
When a young woman is shot to death, Beckett and Castle learn the gun used was the one a serial killer stole from Detective Ryan.
Castle and Beckett investigate a crime scene that involves a large pool of blood but no victim; Alexis receives news about Stanford.
Castle and Beckett suspect a costume-clad vigilante is responsible for the mysterious murder of an ex-con.
Detective Beckett struggles to survive; Castle tries to identify the shooter; Ryan and Esposito try to adjust to the new captain.
An all new season kicks off with exciting discoveries and challenging cases and a tough, new NYPD captain shaking things up.
A professional hit man (Max Martini) with information about the murder of Beckett's mother escapes during a court hearing; Castle and the team uncover a deep conspiracy.
After a contestant in a beauty pageant is found strangled, many suspects turn up, including jealous fellow contestants, the pageant's sponsor (Michael McKean), and the show's host (Sasha Roiz).
Against orders, Beckett travels to Los Angeles while investigating her ex-partner's murder; Castle questions Beckett's motives.
Castle and Beckett investigate the death of a champion swimmer; authors Michael Connelly and Dennis Lehane give Castle advice.
When a reporter is found dead inside a pizza oven, Castle and Beckett try to determine why he was murdered.
A juror suddenly dies during a high-profile trial involving a murdered socialite.
When the head writer on a popular soap opera is killed with a fire axe, Castle is able to use his skills as an author to make a discovery about a killer.
Castle and Beckett must set aside their differences with Agent Fallon while trying to prevent a city-wide catastrophe.
While investigating an apparent robbery-homicide, Beckett and Castle discover the victim was involved in a mysterious conspiracy; as the stakes rise, a federal agent (Adrian Pasdar) takes over the case.
An old friend of Castle's emerges as the prime suspect in his wife's murder.
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