I'm looking for books where the main character doesn't know who the love interest is, but the love interest knows who they are, and they typically communicate through writing which makes it easy for the love interest to hide their true identity. A massive amount of bonus points if they are rivals/enemies. I'm currently reading Divine Rivals and I'm such a sucker for this trope, I need more.
Other examples are the movie You've Got Mail, and the musical Cyrano.
by HauntingGold