Power's dissertation comes as many other Tezuka books have; well thought-out, researched into the ground, and with great pictures at that. The books main fault is its beginning which gives a brief (but not too brief) account of manga before WWII, starting with great visual poets like Kakuyu (1053-1140), who Tezuka appropriated and used himself, and moving all the way to post-war Tezuka, as the title states. It was interesting for me, but for anyone but the hardcore collector, it may seem like a slow buildup to our main subject.
But when Power starts talking Tezuka, it's ON. An in depth analysis covers almost every major work he's done from 'akaihon' like "New Treasure Island" and its wonderful, film-like narrative, all the way to greats like "Black Jack" and "Buddha". Chapter 4 is a look at Tezuka's "Star System", his inherent (and fictional) world of 'stars' that make up his manga world, and, like movie stars, appear all over. This is one of the most interesting and memorable things about Tezuka's art, and Power does a great job reminding us why this man is worshiped as a god.
Power also gives us Tezuka's look at animation and his difficulties with it. Chapter 8 focuses on the multiple styles that Tezuka worked in and one begins to wonder how one man put out so many tens of thousands of pages. But Power covers that as well, telling of Tezuka's large fan-base (ranging from ages 5 to 80) and his loyal workers who did countless hours of beta and coloring work so that he could complete the massive amount of work he started (though "Phoenix" and a few others were left unfinished at his death in 1989).
This is some great research accompanied by untranslated pages of certain Tezuka works, all nicely tied in with each topic. While you may prefer something like The Astro Boy Essays: Osamu Tezuka, Mighty Atom, and the Manga/Anime Revolution, nothing I've seen has come close to the detail and analysis of works outside of his popular manga. This will tie down any Tezuka fan until they rush back to the store for the newest volume of "Black Jack". Highly recommended for ANYONE who knows (or doesn't know!) who the god of manga was, and how he influenced everything we read in panel form today.