Which book and who is the author?

Napoleon was largely a supporter of French Nationalism but also of tolerance. Napoleon did not take issue with other nations promoting their own ways (so long as it fell in line with largely revolutionary principles). I think the dreams of a united and unified Europe in modern terms are a bit inaccurate. It is important to remember that it would eventually become clear to Napoleon that he was just NOT going to be accepted by mainly Austria and Britain. Had the Prussian King not have been married to a war hawk, Prussia may have been neutral throughout the wars.

Napoleon was smart enough to see the limits of his dreams. The continental system was as close as he would get in some ways. Spain and Russia were the problems. They would not readily join the system. Arguably the biggest mistake Napoleon made was not the invasion of Russia but of the invasion of Spain! Also, the fact that Napoleon eventually created a Duchy of Warsaw did not sit well with Russia.

That all being said, Napoleon was quite happy taking reasonable measures. He was the person that was most likely to try to push for peace terms and in general he gave pretty generous terms when he did. The idea he was hellbent on European domination is false. Its simply not true. He did push for a liberalization of Western Europe in his policies and most of his allies also became rather liberalized. I think he largely tried to spread ideas rather than borders.

I suggest reading some Napoleon books by J. David Markham and to check out the Napoleonic Society website for great articles. Alan Schom's Napoleon is really well researched by is essentially a hatchet job of Napoleon. Phillip Dwyer also writes fairly well about Napoleon.