84, Charing Cross Road by Helene Hanff

This funny, poignant, classic love story unfolds through a series of letters between Helene Hanff, a freelance writer living in New York City, and a used-book dealer in London at 84, Charing Cross Road. Through the years, though never meeting and separated both geographically and culturally, they share a charming, sentimental friendship based on their common love for books.