For Davita Chandal, growing up in New York in the 1930s and '40s is an experience of indescribable joy—and unfathomable sadness. Her loving parents, both fervent radicals, fill her with the fiercely bright hope for a new, better world. But the deprivations of war and the Depression take their ruthless toll. And Davita, unexpectedly, finds in the Jewish faith that her mother had long ago abandoned both a solace to her questioning inner pain and...