Twelve-year-old Lidia is outside her grandfather’s house when planes fly overhead, bearing the Nazi cross on each wing. Before the bombs hit the ground, Lidia realizes her life is about to change forever. Poland has fallen under German occupation, and her father makes the brave decision to join the Polish army to fight against the Nazis. Lidia wants to follow him into war, but she’s far too young, and she’s needed by her mother and brother.