I'm about halfway through Dogs of War by Frederick Forsyth (author of Day of the Jackal). It's flat out fascinating - a complete manual of how to overthrow a small African dictatorship, going into insane levels of detail over every facet of such an operation. For research the author met with mercenaries and arms dealers, posing as an interested party in throwing a coup of New Guinea. The balls on this guy.
There's a movie with Christopher Walken that's also pretty good, though it's less interested in the actual mechanics of throwing a coup.
"Metaphysics of Power" by Julius Evola.
I've always been skeptical of modernist attacks on monarchy but Evola is the first person I've seen wholeheartedly defend the concept on its own merits and I have to say I find it quite convincing.
Is it as dense and arcane as Metaphysics of War was? I find the concepts Evola lays out compelling, but his writing is very difficult to parse.
I haven't read war yet - it's next on my list - but most likely yes. There are some books you can breeze through fifty pages in an hour and some where you need the same amount of time for five, and Evola is certainly closer to the latter type.