The film
When a humorous script-reader in her New York apartment sees an ad in the Saturday Review of Literature for a bookstore in London that does mail order, she begins a very special correspondence and friendship with Frank Doel, the bookseller who works at Marks & Co., 84 Charing Cross Road.
Synopsis from TMDB.
The name
Also in 84 Charing Cross Road
Elsewhere on screen, Maxine