This isn't a bad book and whilst it's certainly better than The road to Hastings by the same author, it's still not really top notch. It's an enjoyable read without being particularly challenging.
The first thing you notice, though, is the lack of Athelstan content. The book begins by describing the sources, which is fair enough, but you then learn a lot about Alfred's time, a bit about Edward et al, before you reach our man in chapter 5. Broadly speaking chapter 6 is all about the context of Brunanburh, 7 is a pretty good summary of the arguments of the various locations for Brunanburh and then chapters 8 and 9 are about the history of the kingdom after Athelstan's death. Chapter 10 is Athelstan's memory and legend. So for 200 or so pages of book, you don't really get a lot of Athelstan for your money.
Instead, what you do get is a decent general history of the the 50 or so years either side of Edward the Elder's death, with more detail of the before than the after. This is ok, as far as it goes, but there are a few things that Hill could have explained better. The tribal hidage rating of 100,000 hides for Wessex is quoted, but without any question or explanation as to this extraordinary figure. Hill also takes the term Bretwalda more seriously and anachronistically than many other people. His argument about York/Northumbria not wanting to be ruled by the South would perhaps have been better explained less as almost the traditional North/South divide, but instead as the North not wanting to be ruled by those not connected to the traditional players of the region, or actually resident there. The Hiberno-Norse may have been outsiders, but they did at least set up shop in York, as opposed to the Anglo-Saxon kings, who were visitors.
Three things you'll take from this book:
1, you'll be grateful that other people are wading through the special pleadings of local historians who have 'found' Brunanburh in their localities
2, how uncertain the prospects of an Atheling could be. All it took was an extra marriage or an untimely death for all bets to be off
3, Athelstan did well to push the boundaries of England out and to keep what he gained