'Castle' Book Series To Continue: Nikki Heat Novels Outlive ABC Series

Victoria Miller

Castle may have been canceled, but Richard Castle's book deal hasn't. On the heels of the cancellation of the long-running ABC crime drama, fictional mystery novelist Richard Castle has two new books coming out, according to The Hollywood Reporter.

The first of the Castle-inspired Nikki Heat crime novels is titled High Heat, and it will be released on October 25. THR posted an excerpt from the book, which deals with an ISIS-like group operating in New York City who targets NYPD detective Heat's husband, magazine writer Jameson Rook. The second Castle book, Heat Storm, will be released in spring 2017.

Castle showrunners have always stood behind the façade of the Nikki Heat novels. Nathan Fillion's Richard Castle character penned Heat Wave as he shadowed Detective Kate Beckett (Stana Katic) during the first season of the ABC crime drama, and Fillion's picture even appears on the back cover of the real-life books. In an interview with Entertainment Weekly, Castle creator Andrew Marlowe said his character is the real author of Heat Wave, not a ghostwriter.

"Richard Castle [is the writer]," Marlowe said of the first Nikki Heat book. "The roguishly handsome best-selling author of the Derrick Storm mystery series. He's charming. He's a good writer. And I don't know why you're trying to take credit away from him. The guy worked hard on it."

The Heat Wave jacket states that the book received the Nom DePlume Society's prestigious "Tom Straw Award for Mystery Literature," and real-life mystery novelist Tom Straw appeared on the show in 2009 in an uncredited cameo in the episode "When the Bough Breaks." Straw is the man Richard Castle is sitting with when he is first seen at the launch party for his book Heat Wave.

"I'm going to buy a houseboat and go somewhere tropical," Fillion said. "It's going to be one of those three-story houseboats and I'm going to live on the top two floors while the bottom floor is a general store for odds and ends."

The Richard Castle book series currently boasts seven published titles, including Frozen Heat and Heat Rises. While Fillion's Castle's TV persona has been permanently shelved, diehard fans can't wait for this fall when their favorite crime novelist gets a second life with a new novel.