Interwar Germany represents a highly interesting period from the perspective of police history. This book focuses on the German police force as an instrument of state authority and analyses its role, function and importance in interwar Germany based on the articles published between 1918 and 1939 in the journal ‘Die Polizei’. It reveals that the failure of the Weimar police as an instrument of state authority contributed significantly to the rise of National Socialism and the destruction of the Weimar Republic. After the Nazi takeover, the German police rapidly became a loyal and highly effective instrument of rule for the regime. Hence, the German police in the Third Reich blatantly failed in moral terms, but not as an instrument of state authority.