I couldn’t imagine why any Jews would have stayed in Poland after the war, but before leaving Warsaw we visited a woman who had survived the camps, and she and my mother, who had never met, hugged and cried and talked like old friends. She lived quietly in a shabby building watched over by a large statue of the Virgin Mary in the courtyard. Graffiti on the exterior walls proclaimed that Poland is for the Poles, a vivid reminder of anti-Semitism.