Music in the Night — Michelle L. Levigne

Ess and Carmen are childhood friends who only met in dreams. Orphaned and destitute, Carmen flees enemies she doesn't understand. Ess desperately seeks for her friend, knowing their enemies all too well.

Brogan is a creature of the darkness, his music stolen and his face scarred by tragedy. He leads an underground community of people left destitute by injustice and tragedy. Crystal in his flesh and bone allows him to hear Carmen sing in the night. When she takes refuge in his world of tunnels and shadows, she brings him hope that he isn't going mad after all.

Ess and Carmen finally meet, resolving puzzles more than twenty years old. A future of possibilities open before them, but only if they can defeat the Revisionists who will destroy them all to control crystal's power, the future, and rewrite the past.