What has the author J C Dancey written?

There isn't enough information to answer your question. It seems you're asking about a writer named "J C Dancey," but there's no widely known author by that exact name.

To help me find the author you're looking for, could you please provide:

* The full name of the author: It's possible the name is slightly different or has initials that are not "J C".

* The genre of their writing: Do they write fiction, non-fiction, poetry, etc.?

* Any specific books or series they have written: This would be the most helpful clue.

Once I have more details, I can try to find information about the author and their work.