No, I don't write ghost stories. But I do write like a ghost, so to speak. In some areas of digital forensics, I might just know more than the average examiner, and I have been asked to write about it by others for their books. In every case, I have had a NDA (non-disclosure agreement) that states I can never, or for years, disclose what I have written for whom. I've written for websites, articles, and published books. I am sure that if you read enough forensic materials, you read some of what I have written but just don't know it. You have also come across articles I have written on infosec websites under the name of someone else.
I have reduced my ghost writing efforts because the time involved is usually more than the rewards (both personal and financial). However, given a good subject, I'm always open to consider it, so feel free to ask me.