Claire and Alex search for Kaia Nieves, the dream walker responsible for opening the rift that Sam and Dean went through, as she holds the key to their whereabouts.
Jody calls her friend, Donna Hanscum, to round out the team and the women head off on the most important hunt of their lives.
It is entirely in character from the dedication to the acknowledgments, although the latter mentions the principal cast and the show's creators by first name.
The season three finale introduced a graphic novel based on Castle's previous novel character, Derrick Storm.
The overarching plot of the series focused on the romance between the two lead characters and their ongoing investigation of the murder of Beckett's mother.
On May 12, 2016, it was announced that despite some cast members signing one-year contracts for a potential ninth season, the show was canceled.
Typically, they discuss Castle and Beckett's current case and tease Castle about his involvement with Beckett.
Following Cannell's death on September 30, 2010, an empty chair was kept at the poker table for a year in his honor.
Castle decides to use Beckett as his muse for Nikki Heat, the main character of his next book series and uses his friendship with the mayor to force the police to let him shadow Beckett.
Castle's exuberant man child personality clashes with Beckett's more reserved and professional demeanor, but the two eventually become friends and then lovers.
Richard Castle (Fillion) is a famous mystery novelist.
Bored and suffering from writer's block, he kills off the main character in his successful book series.
The first novella of the series, A Brewing Storm, was released in digital media on May 1, 2012. 13 on The New York Times E-Book Fiction Best Seller list, on the combined Prints & E-book list on August 26, 2012.