A young girl is forced into slave labour in a munitions factory in Nazi Germany. In addition to her other tasks, Lida''s small hands make her the perfect candidate to handle delicate munitions work, so she is sent to a factory that makes bombs. The gruelling work and conditions leave her severely malnourished and emotionally traumatized, but overriding all of this is her concern and determination to find out what happened to her vulnerable younger sister. With rumours of the Allies turning the tide in the war, Lida and her friends conspire to sabotage the bombs to help block the Nazis' war effort. When her work camp is finally liberated, she is able to begin her search to learn the fate of her sister.