London schoolgirl Hettie hears the whispers and sees the worry creeping across her parents' faces.She watches as the windows in her home are blacked out.She helps her dad build a bomb shelter. She learns how to wear a gas mask. The German war machine, led by Adolf Hitler, is stomping its feet on Great Britain's doorstep, and Hettie knows only one thing for certain: When the bombs come, it will take all the courage she has to be brave and survive.