Who are the Christian fiction authors that you find your people can connect spiritual truth in their stories? Charles Martin, Lisa Wingate, Richard Paul Evans, and Cathy Gohlke come to my mind.
Perhaps as people return a book, we ought to ask them what spiritual truth they gained from the book. I doubt anyone else will ask them to think that way. Reading Christian fiction can be a remarkable spiritual transformation experience. Some of us have started keeping a journal along side a book so that we can capture those experiences by writing about our reading experiences.