Guernica, 1937. When the bombers appear over the horizon, 17-year-old Sibil Helinger is enjoying market day in the small Spanish town of Guernica. With no warning, clouds of German planes are upon them and bombs fall on the town like rain. Reeling with shock, Sibil spends the next few days frantically searching for her relatives in the smouldering rubble. Though she finds her little sister trapped in the ruins, she discovers her mother and the others are dead. Years later, while WWII rages, Sibil and her sister are living with their father - an eminent scientist reluctantly working with the Nazis. Sibil has grown into a beautiful young woman fuelled by a dark rage. In short, she has grown into the perfect spy to join the German resistance and fight back against those responsible for her mother’s death.