The book is a selection of Nock's writing from various other books. In that sense, it's a bit hard to review, since the whole book is basically just quotes from other books. Plus, I've already quoted some of the excerpts in my other reviews of Nock's books.
I think people new to Nock would be better off starting with his memoirs.
For those that have read a bit more of Nock, this book may help clarify some of their thinking. For example, I think that I'll take two clarifications away. The first is Nock's strict differentiation between "the State" and "government". Despite what others say, I don't get the impression Nock is an anarchist (he's a minarchist). He is simply opposed to the State. Here are a couple excerpts that will make this point:
I even think I could go to Prussia and be hammered around by the police awhile, if only they didn't pretend they were doing it for the glory of God or to make the world safe for democracy or some other loathsome humbug.
Second, for Nock, perhaps the worst consequence of the State the degredation of humanity. With the State, people become servants or helpless – in short, the State causes moral decay. In his own words:
Whether you like these points or not, I highly recommend reading Nock.