At the very start of this documentary, we are shown a photograph of a woman staring into the camera. It's fairly unlikely she knew it was pointing at the group in which she was standing, but it was taken as the Ravensbrück concentration camp was being liberated by the Swiss Red Cross in 1945. She is quickly identified as Nadine Hwang and now director Magnus Gertten tries to piece together her story. For that, he is fortunate. She kept a series of diaries and when it falls to her grand-daughter to finally read them - with quite a degree of emotion-laden trepidation - we discover that before the...