The documentary spins a tale of Samuel Willenberg's life. He was 20 at the outbreak of the armed revolt on August 2nd of 1943 in the death camp of Treblinka in Poland. As a result of the revolt 400 out of 1000 inmates managed to escape Treblinka. 67 of them survived the war. The Last Witness is the first film to tell the story of the Treblinka revolt and the SS Sonder Commando (special unit).