As close as sisters for 20 years, Sarah and Lauren have been together through high school and college, first jobs and first loves, the uncertainties of their 20s and the realities of their 30s. 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 the subject herself.

Once, Sarah and Lauren were inseparable; for a long a 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?

With impeccable style, biting humor, and a keen sense of detail, Rumaan Alam deftly explores how the attachments we form in childhood shift as we adapt to our adult lives - and how the bonds of friendship endure, even when our paths diverge.