“I think there is a through-line,” Rowling said. “Mortality, morality, the two things that I obsess about.” “The Casual Vacancy” is not a whodunnit but, rather, a rural comedy of manners that, having taken on state-of-the-nation social themes, builds into black melodrama. Its attention rotates among several Pagford households, in the Southwest of England: a gourmet-grocery owner and his wife; two doctors; a nurse married to a printer; a social worker. Most of the families include troubled teens.C

Barry’s civic influence is revealed by his departure, rather as George Bailey’s is in “It’s a Wonderful Life.” The story is driven by the long-standing frustration that some of Barry’s disagreeable and right-wing neighbors have about the town’s administrative connection to the Fields, an area of public housing and poverty on the edge of a larger, nearby town. Historically, children from the Fields have had the right to attend primary school in Pagford, a place of flower baskets and other middle-class comforts, and the town has also supported a drug-treatment clinic that serves the neighborhood. In the absence of Barry’s righteous influence, the anti-Fields faction sees an opportunity to rid Pagford of this burden. This is a story of class warfare set amid semi-rural poverty, heroin addiction, and teen-age perplexity and sexuality. It may be a while before we’re accustomed to reading phrases like “that miraculously unguarded vagina” in a Rowling book, and public response to “The Casual Vacancy” will doubtless include scandalized objections to the idea of young Harry Potter readers being drawn into such material. “There is no part of me that feels that I represented myself as your children’s babysitter or their teacher,” Rowling said. “I was always, I think, completely honest. I’m a writer, and I will write what I want to write.”