On September 29-30, 1941, Sonderkommando 4a of the Einsatzgruppe C, assisted by two battalions of the Police Regiment South and Ukrainian Auxiliary Police, and without any resistance from the local population, shot dead in the Babi Yar ravine in the north-west of Kiev 33 771 Jews. The film reconstructs the historical context of this tragedy through archive footage documenting the German occupation of Ukraine and the subsequent decade. When memory turns into oblivion, when the past overshadows the future, it is the voice of cinema that articulates the truth.