In the summer of 2015 former Auschwitz clerk Oskar Groening - then aged 93 - was charged as an accessory to the murder of more than 300,000 Jews at the infamous death camp. During the subsequent trial, 81-year-old Auschwitz survivor Eva Kor was called to give her testimony on the medical experiments she endured at the hands of Josef Mengele. Finding herself face-to-face with a Nazi for the first time in more than 70 years, Eva chose to embrace Groening, publicly forgiving him despite the role he played in the deaths of most of her family. This documentary explores the impact of her decision to absolve Groening, who was ultimately sentenced to four years in prison, and also tells the emotional stories of the last surviving Auschwitz inmates living in Britain, some of whom have expressed anger at Eva's actions, considering them a betrayal of those who lost their lives in the concentration camp.