Alright, I know there's controversy regarding whether or not ol' Billy got his ideas from Douhet, but come on. Really? He definitely did, right? Mitchell's book is a valuable insight into the man's thoughts at the time. His work is clearly intended for the general public and it results in an easier read than Douhet. Of course, that also means it's much lighter on actual justification. While Douhet was mistaken (at least today) regarding his underlying "invincibility of air power" premise, his argument is at least logical. Mitchell's work is more a work of persuasion and call for independent air force than it is a theoretical proof of concept.
That said, his writing is smooth (if repetitive) and easy to follow. His account of the battleship tests was particularly entertaining. Overall, this is a valuable look at the thinking of the time through the eyes of perhaps the largest American air power advocate of the time.