This is a comprehensive book about the rise and fall of the German Reich from 1866 to 1945. It starts in 1866 (the victory against the Austrian Empire which manifested Prussian dominance over the Austrian Habsburg Empire) and spawns over the
unification of Germany after the war against France in 1870/71, the years of Bismarck'ian diplomacy, WWI, the Weimar Republic and Great Depression, the rise of the National Socialist party until the final defeat an partition of the German Reich in 1945.
The book covers all aspects of interest (economics, culture etc.) and gives a broad introductory survey of the topic. If you are interested in the history of Germany I can only recommend this book (along with the "The History of Germany Since 1789" from Golo Mann, son of Thomas Mann)!