"So, less than a decade ago Magical Britain began dealing with their equivalent to Hitler. And the Allies were losing. BADLY. Fate decided to intervene, which leads to Holly. Her parents did some really powerful, sacrificial Old Magic, exchanging martyrdom for their Holly's life and the destruction of Magical Hitler when he came personally to kill them and their baby. Their gambit worked, and Magical Hitler was disembodied, which caused the magical Nazi party to collapse."