This well-documented book deals with German physicists under Hitler’s Third Reich and with their reactions to the political situation created under the Nazis. It describes the pre-Nazi German academia and its response after the Nazi’s assumption of power to the state’s anti-Jewish laws. The great cost to German science of the Nazi’s anti-Semitic campaign is also covered. This book’s main focus, however, is on Aryan physics, which incorporated Nazi racial policies, and on Aryan physicists, such as Philipp Lenard and Johannes Stark. It closes with a description of German physics during World War II and the decline of racially motivated physics.