What If He Wasn't Alone? (A Phantom of the Opera Fanfiction)

You might know the story of the infamous Phantom of the Opera. How he was banished from society, and doomed to forever be alone, and how he loved the rising Prima Donna, Christine Daae. But what if there was someone who saw him? What happens when a curious little ballet rat named Isa wanders to the depths of the Popul...