The line between mainstream and Christian fiction gets thinner and thinner. That’s because the quality of writing by identifiably Christian authors gets better and better. There has always been a strong thread of Christian theology running through mainstream fiction, from Flannery O’Connor to Marilynne Robinson. The ironic key to this successful wedding of religion and high art has always been the subtlety of the moral of the story, which must be subordinate to the storyteller’s art. The same principle elevates the novels of Virginia author Billy Coffey (The Devil Walks in Mattingly).