As close as sisters for twenty years, Sarah and Lauren have been together through high school and college, first jobs and first loves, the uncertainties of their twenties and the realities of their thirties. Sarah, the only child of a prominent intellectual and a socialite, works at a charity and is methodically planning her wedding. Lauren—beautiful, independent, and unpredictable—is single and working in publishing, deflecting her parents’ worries and questions about her life and future by trying not to think about it herself. Each woman envies—and is horrified by—particular aspects of the other’s life, topics of conversation they avoid with masterful linguistic pirouettes. Once, Sarah and Lauren were inseparable, for a long time now, they’ve been apart. Can two women who rarely see each other, selectively share secrets, and lead different lives still call themselves best friends? Is it their abiding connection—or just force of habit—that keeps them together?