Marceline Loridan-Ivens was just fifteen when she was arrested by the Vichy government's militia, along with her father. He prepared her for the worst, telling her that he would not return. They were soon separated. The three kilometres between her father in Auschwitz and herself in Birkenau were an insurmountable distance, and yet he managed to send her a small note via an electrician in the camp - a sign of life. In But You Did Not Come Back, Marceline writes a letter to the father she would never know as an adult, to the man whose death enveloped her whole life. Her testimony is a haunting and challenging reminder of one of the worst crimes humanity has ever seen, and an affecting personal story of a woman whose life was shattered and never totally rebuilt.