Barbara Kingsolver's new novel, They Call Me Demon Copperhead, takes us in the footsteps of an orphan in the Appalachians. Kingsolver: “The system of foster children is managed, as is often the case in America, like a business that must make a profit” “I deal with delicate subjects, not very glamorous at first glance: colonialism, child abuse, climate change… But as I am a well-bred person, I consider that I must keep my end of the bargain with readers”