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One Day You'll Understand is a drama, a co-production of France, Israel and Germany, which deals with one family's memories of the Holocaust. Jeanne Moreau plays a woman who barely lived through the ordeal, as the Jewish wife of an "Aryan" husband. Years later, her son has become obsessed - almost to the breaking point - with finding out the family history. He has become particularly unstrung because he has found a letter in which his father certified the Jewishness of his wife and asserted his own Aryan lineage.