On the morning of November 7, 1938, a seventeen-year-old Jewish refugee, Herschel Grynszpan, walked into the German embassy in Paris and in an act of desperation assassinated Ernst vom Rath, a low-level Nazi diplomat. He did it, he said, out "of love for my parents and for my people." Two days later, vom Rath lay dead, and the Third Reich exploited his murder to inaugurate its long-planned campaign of terror against Germany's Jewish citizens, in the...