A case involving an insurance agent brings Castle and Beckett, who are still on the outs after he looked into her mom's case, back together.

Two murder victims are found prompting Castle and Beckett to bet against Esposito and Ryan to see who solves their case first.

Castle and Beckett get an inside look at the cutthroat world of the New York fashion industry when they investigate the brutal murder of a young model during Fashion Week.

A case near Halloween has Castle and Beckett investigating the death of a man in a graveyard, wearing fangs.

A singer is found dead, hanging upside down on a fire escape. Ultimately, it's Alexis who helps solve the case.

A bike messenger gets hit by a car and his carrier bag stolen. The bag contained evidence pertaining to an old case that Montgomery worked on.

A man leading a double life is found dead in a garbage chute.

A death of a bridesmaid reunites Castle with his long lost love.

A baseball player is found dead in Spanish Harlem. It's found that he had many people hating him because he went to Cuba and shook hands with Castro.

A naked woman is found bound and hanging from monkey bars. Castle and Beckett look into the world of dominatrix.

In a two-part storyline, Federal Agent Jordan Shaw, an insightful and accomplished Federal investigator, teams up with Castle & Beckett to hunt down a cunning and elusive serial killer.

The serial killer remains at large and is taunting Castle, Beckett and Jordan Shaw to catch him.

When a talk show host tells Castle someone wants him dead and dies the next day, Castle asks Lanie to prove his death was a homicide.

When an ex-con is tortured to death, Castle and Beckett reveal a shocking connection between a suspect and Esposito's former partner, who presumably died.

The death of a popular chef reunites Beckett with her high school best friend who owns the restaurant the chef worked at.

Beckett asks Demming to join their robbery-homicide case causing Castle to want to solve the case first.