The Rise, Rule, and Fall of vampires

The existence of the supernatural is now known. For years, there was an understanding, and almost a harmony between the supernatural, and the normal humans. But, one day, the vampires rebelled and took over the world. Then came the hunters, the ones trained to destroy the vampires, but the only way to wipe them out.... is a child that has not been born yet, and will possibly never be born, because this child is supposed to be a girl, in a bloodline that has birthed nothing but boys. Will she ever come to bring humanity back into the light? or will the vampires rule forever.