A powerful new film about Jan Karski, the Polish resistance figure who attempted to expose the Warsaw Ghetto and Belzec, and met with President Franklin D. Roosevelt and Supreme Court Justice Felix Frankfurter.

The film tells the story of a member of the Polish underground who acted as a courier during World War II and whose most prominent mission was to inform the Allied powers of Nazi crimes against the Jews of Europe in an effort to prevent the Holocaust.

Director Claude Lanzmann spent 11 years on this sprawling documentary about the Holocaust, conducting his own interviews and refusing to use a single frame of archival footage. Dividing Holocaust witnesses into three categories – survivors, bystanders, and perpetrators – Lanzmann presents testimonies from survivors of the Chelmno concentration camp, an Auschwitz escapee, and witnesses of the Warsaw Ghetto Uprising, as well as a chilling report of gas chambers from an SS officer at Treblinka.