Primo Levi's correspondence with Hety Schmitt-Maas

In Levi's essay collection 'The drowned and the saved', he refers to a German admirer of his as "Mrs. Hety S". In the course of her life she wrote a total of 57 letters to Levi, and he 49 to her. She was interested in the moral and material ruins of post-Nazi Europe. She was vitally important to him - some of his books could not have been written without her