This is popular history at its best - no academic discussion about the translation of phrases from obscure original sources or dry machinations of government, just a tale well-told. Many British readers will know about the invasion of our country and Hadrian's Wall, but few will know about the population movements and battles in eastern Europe (in this case along the Danube and south into modern Turkey) that were such pivotal events in the history of the Roman empire. The tale of this battle, which the author argues marked the beginning of the end, is told at pace and with just enough lively detail to paint the picture for an interested layman. At 146 pages long (plus notes and suggestions for further reading) you could probably read this in one sitting on a medium-distance train journey. Huge credit for the readability goes to Barbero, the author, of course, but also to John Cullen, the translator. You wouldn't think it was possible to make a Professor of Mediaeval Studies sound interesting but he pulls it off!
One of the other reviews here states the book has no maps. I am using the hardback version from 2007 (which is cheaper than the 2008 paperback, incidentally) and it has a map at the start of the book ... but it is of the whole of Europe and beyond from the Orkneys to the Red Sea so trying to spot the manoeuvres of two armies maybe 10 miles apart from each other is impossible. However, Wikipedia has a `Battle of Adrianople' page (largely a summary of Barbero's book!) but it does include a diagram of the battle.
Pictures of the battlefield site are harder to come by (even trusty Flickr has let me down) but please leave a comment below if you can link to any.
I would recommend this book to anyone interested in the history of the Roman empire, whether you have heard of this battle before or not.