As Beckett and Castle investigate a murder at a sci-fi convention, they encounter avid fans in costume, egotistical celebrities and a lot of drama.
The investigation into a ritualistic murder turns up evidence linking Castle to the crime, leading Beckett to wonder how well she really knows him.
Castle's plans with Beckett are disrupted when a dying man stumbles into his backyard and collapses in his pool.
When a woman is murdered, Castle and Beckett think a repossessed storage unit may have a connection to her death.
On Beckett's first day back from suspension, she and Castle investigate a weathercaster's death, and try to hide their relationship from their co-workers.
Castle and Beckett set aside questions about their relationship in order to take on the forces responsible for Beckett's mother's murder.
Castle tries to protect Beckett as she pursues the man who shot her; the 12th precinct is forever changed as feelings and secrets are revealed.
When a dead man is found with human bite marks on his body, a witness claims the deceased was attacked by a zombie.
Castle takes on Detective Ethan Slaughter (Adam Baldwin) as his partner when tension between himself and Beckett rises, and he sees a new side to police work that puts him in danger.
A detective from Scotland Yard teams up with Castle and Beckett on a murder investigation.
When a bomb kills five people at a protest rally, Beckett and Castle try to solve the case by reconstructing the 47 seconds prior to the explosion.
The investigation into the death of a contestant on a popular dance competition show leads Castle and Beckett to a shocking secret that may have led to her death.
When two women are found dead dressed as fairytale characters, Castle and Beckett must race to find the killer before he strikes again!
Beckett and Castle must stop a series of events that could result in a war.
Castle and Beckett discover the killer they are pursuing is part of an international conspiracy and they must work with a CIA agent with whom Castle has a history.
Castle and Beckett must investigate a mysterious case from 1947 in order to solve the present-day murder of a treasure hunter.
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