Alas, someone has written a book and it's terrible. But they won't give up the dream of seeing it in print. You could be hired to resuscitate the book (which may mean anything from a little editing to a full blown do-over or ghostwriter gig). You may also help the author find an agent or publisher, or help with their self-publishing plan. You'll have the satisfaction of seeing the project live on, but you won't get the joy of a byline.