Ming Qong is convinced that girls have changed the world throughout history.

So when Ming is thrust back in time to Belgium during WWI, only to be rescued from a burning cellar by Marie - an experienced spy at only 12 years of age - she finally has her proof. Marie is involved with a female secret resistance group who risk their lives to outwit the German troops.

But Ming now faces a tough choice: will she send coded messages and risk her own life in this war on which the future depends? As Ming learns, change is never easy, so how can one girl change the world?