A little-known name linked to a film that was to profoundly shake up our notion of history. Ziva Postec devoted nearly six years of her life to editing Shoah: the epic opus by Claude Lanzmann that would shed harrowing new light on the extermination of the Jews during the Second World War. Delving into her memories, the editing room virtuoso—a survivor in her own way—tells her story for the first time, going behind the scenes of the monumental undertaking to bring previously unseen footage to the screen. Performing her task with a devotion bordering on obsession, Postec reveals herself as a humble heroine, one whose unwavering commitment and luminous intelligence contrast sharply with some of humanity’s darkest hours.