Ingeborg Hecht's father, a prosperous Jewish attorney, was divorced from his titled German wife in 1933--two years before the promulgation of the Nuremberg Laws--and so was deprived of what these laws termed "privileged mixed matrimony." He died in Auschwitz. His two children, called "half-Jews," were stripped of their rights, prevented from earning a living, and forbidden to marry. In Invisible Walls, Hecht writes of what it was like...