Berlin, August 1961. Sabine lives in a cramped apartment with her grandmother, mother, and older half-brother, Erich, in East Berlin where neighbors spy on each other, books are forbidden, and sometimes people disappear in the middle of the night...to the west. When Sabine discovers a forgotten underground bunker, she first uses it to escape her crowded home. After the Soviets build a barrier through the middle of Berlin, Sabine thinks of a new use for the Bunker. Could it take her family under the Wall to freedom? Or are their lives in more danger than ever?