"Growing up gifted and working-class poor in the foothills of the Ozarks, Monica and Darci became fast friends. The girls bonded over a shared love of reading and learning, even as they navigated the challenges of their tumultuous family lives and declining town -- broken marriages, alcohol abuse, and shuttered stores and factories. They pored over the giant map in their middle-school classroom, tracing their fingers over the world that awaited them,...