Marceline is fifteen when she arrives at the camp with her father. She goes to Birkenau, he to Auschwitz. She survives, he does not. Seventy years later, she writes him a letter that he will never read. A letter in which she tries to express the unspeakable: they are only three kilometers apart, separated by gas chambers, hatred, and the constant uncertainty of what is happening to the other. Once, her father manages to send her a small message on a piece of paper. But she forgets the words immediately and will spend her life trying to piece together the broken memory. Marceline Loridan-Ivens writes about these events and her impossible return home, about her life after death, the fractured continuation of life in a world that wants to hear nothing of what she has experienced and suffered. And about the gradual.