But a couple of writers tipped their hands to CBS News Sunday Morning just a little bit. Here are a few facts about two of them.
Author: William Caunitz
Ghost: Chris Newman
Title: Chains of Command
How He Got Started: When Caunitz died in 1996, leaving 100 pages of an unfinished novel, the publisher asked Newman to complete it. "Bill had done an awful lot for me," explains Newman. "And me being able to pay that back somehow or another seemed like a kind of fun idea. I said, 'Sure, send me the stuff.'" Newman ended up writing about three quarters of the book.
Authors: Liz & Beth (two flight attendants)
Ghost: Donald Bain
Title: Coffee, Tea or Me
The Ghostwriters' Ethic: Says Bain: "You'll find a writer will become very successful with a first or second novel. And they get busy being famous, you know, and they'll turn to a ghost."
But do they tell their readers?
"No, no, no. Of course not. It's understood that I will not do that. It's an ethic of ghostwriting."