I remember it from my teen age years--it is one the best books on the basic mindset behind German Policies prior to two World Wars, especially under the Kaiser Wilhelm II, but also as a driving force in a nation's formation of policies as an expression of a the national set of beliefs and attitudes. I was saddened when the local library recently withdrew the volume from the collection.
The real value of the lesson of the book's thesis, which is, that the First and Second World Wars were a result of the the expressions and efforts by Imperial Germany (and the Kaiser), but also that the thrust of the policy that was employed compelled the circumstance that caused the Two Wars, partly by conditioning both the ruling classes and elites, with the people, to the idea of war as a glorious tool to implement national foreign policy --the definition of war by von Clauswitz in "Auf Krieg"--"On War".