I did a search on Google and the name of the writer is a secret. I do know that there are a number of writers skilled in writing novels from movies or tv series (look at all those Star Trek books) and sometimes they are credited and sometimes not.
It is a fun topic.
I read a tie-in comic recently that had the author's details inked in on the inside cover. I'm guessing the ghost writer will either be credited or they will keep them under wraps.
Takes quite a bit of skill to write from a fictional character's writer's perspective. I'm guessing the ghost is probably behind some already famous names who use ghosts to meet marketing deadlines.
You beat me to it. I was going to say Stephen would have a hard time being the ghost writer.
I can't see Connelly being the ghost. For him it was a cool chance to come down and broaden his appeal. Patterson can't find enough ghosts himself.
I can just about guarantee that Connelly and Patterson don't have any hand in the books. They are invited down as guests by the producers who want to lend a level of authenticity to Castle's role as super author. Connelly told me he didn't even write his own lines that he speaks on the show (but he did love the lines).
I doubt Nathan writes. He seems to spend his spare time Twittering about charity events and his travels.
The Derrick Storm comic I read (currently #1 at Amazon in graphic novels) was written by Brian Michael Bendis and Kelly Sue Deconnick. Kelly is a Marvel comic author, and Brian is an Eisner Award winning comic author. If that is any indication it is likely that they will get professional thriller ghosts.
Oh. Just did some digging and found out that it is Dan Brown doing the writing.http://www.goodreads.com/author/show/1953433.Richard_Castle?origin=