Witnesses to the brutal murder of their families and neighbors and the violent destruction of their communities, a cadre of Jewish women in Poland—some still in their teens—helped transform the Jewish youth groups into resistance cells to fight the Nazis. With courage, guile, and nerves of steel, these “ghetto girls” paid off Gestapo guards, hid revolvers in loaves of bread and jars of marmalade, and helped build systems of underground bunkers. They bombed German train lines and blew up a town’s water supply. They also nursed the sick, taught children, and hid families. Yet the exploits of these courageous resistance fighters have remained virtually unknown. The Light of Days at last tells the true story of these incredible women whose courageous yet little-known feats have been eclipsed by time.