For those of you who watch the TV show Castle, you are probably aware that even though Richard Castle is a fictitious character, you can actually purchase his Nikki Heat books in real life. Sales figures from stores such as Barnes and Noble and Amazon illustrate just how popular his books are with Castle fans.

But let’s be honest, a fictitious character can’t write a book, which explains why one of the most frequently asked questions online is “Who writes the Richard Castle books?”

I’m pretty sure I know (spoiler: it’s not Justin Bieber).

1. The person who writes the books is female (No, it’s still not Justin).  Richard Castle’s ghostwriter is a woman. I have read six of the seven Castle books, and I like them a lot. But the one thing I notice is that at least twice in each book, Castle thinks or acts like a woman. It’s nothing obvious like leaving the toilet seat down, or enjoying a corn dog just a little too much, it’s simply that, occasionally, he seems to sound an awful lot like Nikki Heat or the female medical examiner. Sometimes he just oozes estrogen.

2. The person who writes the books is probably married. The banter between Nikki Heat and Jameson Rook sometimes plays out like a married couple. It sounds too comfortable. It doesn’t depict playful dialog or the sexually charged atmosphere of two co-workers flirting with each other.

3. The person who writes the books has a very distinct “voice”. “Voice” describes the style or inflection of the writer. It’s the way someone describes scenes or creates dialog; no two writers do it exactly the same way.

For example, if I asked Stephen King and JK Rowling to write a short story about the first day of kindergarten, we could probably figure out who wrote which – we recognize the voice of our favorite authors. Of course, if the story is about a kindergarten teacher being disemboweled by a psychopathic six-year old, and buried in the school sandbox, we might have a clue as to the author’s identity.

4. Finally, this particular writer has a “tell”. In several of the books, the detectives speed off to the crime scene, but before doing so, place the portable light and siren on the roof of the squad car. Our writer likes to use the term “gumball” when referring to this light, as it slightly resembles an old-style gumball machine. This term is not very common; I believe the last time it was used was during the Starsky & Hutch era of television. I have only heard this term used in two of the Castle television episodes, and they were both written by the same author.

The person, who penned these two episodes, and the obvious ghostwriter of the Richard Castle books, is Terri E. Miller, one of the Castle writers and producers.

Mystery solved!

**UPDATE September 1, 2015** I just finished reading the sixth book, Raging Heat, which was great, but I have to say I think this book was written by someone other than Terri E. Miller. The voice on this one sounds totally different than the last five books. I guess it’s time to figure out the new author author now- maybe Terri’s husband, Castle creator, Andrew Marlowe? He’s also an amazing writer- so it could definitely be him.

Another mystery to be solved!

BTW, if you have time, check out my first book:   The Toaster Oven Mocks Me.  It will make you laugh!

Written by stevemargolis



I really love this show and hope it continues for many years to come. Both Castle and Beckett are gorgeous and deserve to be together.

mary humphrey

I really like this mysterious writer one day I will figure out who he or she is.I just would like to know if they have written anything else so I can read those books too.

Steen Rancher

To my shame, I am new to watching Castle. Gave me a lot of watching without waiting for the next episode though.

I am betting on Michael Connelly as the author because his name gets used a lot more than Patterson’s and Steve, well, he ain’t writin’ no mo’.


I recently started watching Castle and just found out about the book series. I’m very curious as to who writes the books. I personally want it to be Connelly because I love his books (which by the way he is still writing, he has a new one out right now).


I agree with you, Steve, that Richard Castle is a woman. I think it stands out a mile. Thanks for the clue about the use of ‘gumball’. Sounds plausible that the author is Terri E Miller. It’s good fun guessing, anyway.


It’s also worth noting that in at least one of the books, the author credits Terri E. Miller as his/her partner in crime. And, finally, Terri E. Miller is married to the show’s creator Andrew W. Marlowe.


“Castle thinks or acts like a woman”? What sexist, reductive bullshit. If the author does turn out to be a woman, you’ll be correct only through luck rather than by your narrow-minded ‘analysis’.


Why so angry? We’re just having fun trying to guess the real author. I agree with Steve that sometimes Castle’s thoughts or actions are iINCONSISTENT with the character’s USUAL, male persona and could suggest that the (female?) writer’s own modus operandi is peeking through.


This is a very good theory. I read up on Terri Miller E. Miller and she is a very good writer with a ton of Castle credits, and also her husband created the show. I think it is her too!


It does make sense as she is married to the executive producer.creator. She’s a great writer and she has her husband there to help with the plot problems.
It could also be Penny.


I read that the author has been on Castle. Has she ever been on the show?

John Uce

Here’s the appplicable citation from the link:

Watch: Both for Andrew W. Marlowe and Terri Edda Miller make a cameo appearance as the couple who are in the building across from Castle’s loft, in a nod to Hitchcock making cameos in his own films.


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