The Demon Child

Gabriela Erskine is a fourteen-year-old girl, which most people call the Demon Child. She has strange powers. It is Sherman's birthday next month, and what better gift than an older sister? But when the Wayback messes up, and turns Mr. Peabody into a man, that is only the beginning. For the Queen of the Demons wants him(a Mogadorian), and only the Demon Child can save him.