The lure of Barbara Kingsolver’s latest novel begins with its title: “Demon Copperhead.” What, now? This sprawling, brilliant story, set in southwestern Virginia’s impoverished Lee County in the 1990s and early 2000s, is a modern retelling of “David Copperfield.” You don’t need to have read Charles Dickens’ masterpiece to appreciate Kingsolver’s work, but some familiarity will add to the appreciation: OMG, is that nasty U-Haul guy really Uriah Heep? Is fragile little addict Dori based on Dora? If so, she’s doomed! Demon Copperhead, birth name Damon Fields, is a greeneyed, red-haired lad born on the grimy floor of a trailer to a doomed teenage addict. Schoolkids twist his first name into “Demon,” his last name into that of the lethal snake.