...about a young man and a young woman who meet and hit it off. They bring light to each other's life. They build each other up. They edify and educate one another. They recall past experiences to one another. There's one catch: their whole relationship/friendship exists through letters. They lead completely different lives but they become very close and no one knows about it except them. They see each other rarely and their friendship exists only in the letters. My problem is I don't even recall the author's name. Can any of you literary buffs help me out on this one? Someone suggested Hemingway and the other Whitman, but I've yet to find the story.