Jews in Warsaw during the 1940s were under increasing threat as they were stripped of their rights and forced to live in guarded ghettos away from the Aryan Polish population. This book considers the scope of national and cultural affiliations among people who remained between traditional Jewish and Polish communities, and who with the onset of World War II became the subject of Nazi racial policy as "non-Aryans."

Katarzyna Person is a historian of the Holocaust and Deputy Director of the Warsaw Ghetto Museum. She has published extensively on the history of Jews in Poland during the Holocaust and in the immediate post-war period. She is a recipient of the 2024 Dan David Prize.