"Ranita Atwater is wrapping up her four-year sentence for opioid possession at Oak Hills Correctional Center, near Boston. With three years of sobriety, she is determined to stay clean and regain custody of her two children from her aunts who have been raising them. My name is Ranita, and I'm an addict, she has said again and again at [Narcotics Anonymous] meetings. But who else is she? Who might she choose to become? She is gaining her freedom, but...