Neighborhoods can become cities within cities, providing their residents with the sort of community that human beings crave. But proximity combined with intimacy can mean vulnerability. In new novels by Anna Quindlen and Abbi Waxman, two women are shaken to their core by the real-life dramas that play out on their streets. Each book is set in one of the nation’s largest cities but centers on a single neighborhood block. The lives that intersect in those spaces become a microcosm of interpersonal complications.