At ten years old, Eva Mozes Kor arrived at Auschwitz with her twin sister Miriam and was pulled aside for Josef Mengele's genetic experiments, injected with unidentified substances and monitored for their effects on her body. The film follows her account of surviving that ward, the death of her parents and older sisters, and her postwar life in Israel and then Indiana, where she eventually built a public career as a Holocaust educator. It traces her role in tracking down former Nazi doctors and helping organize a reunion of Mengele's surviving twins, gathering testimony that fed later war crimes investigations. The most difficult material concerns her 1995 decision to publicly forgive the Nazis, including a face-to-face meeting with a former SS officer, a stance that divided fellow survivors and drew criticism she addresses directly on camera. Archival photographs, Auschwitz footage, and interviews with Kor herself carry the narrative, building a portrait of one of the last widely recognized voices to speak firsthand about the camp's medical experiments before her death in 2019.