I'd been looking for a richly detailed, general-audience biography of Alfred the Great for many years now -- I read a lot of historical and fantasy fiction, and every year or so I'd read something that drew on Alfred's legend and then find myself on the 'net for an hour or so, reading about the burned cakes or his army in exile at the swamps of Athelney; and then I'd wish I had a good in-depth biography close to hand -- something that would give me a detailed image of Alfred's life and times, not just the dry facts I could glean from a google search.
This is the book I'd been looking for. There's a rich wealth of detail about Alfred's life, associates, friends, enemies, and family, and the author has very clearly done extensive combing of the available historical record. More importantly, though, the author makes a deliberate effort to bring Alfred's surrounding culture to life as well, and we're given not just Alfred's history, but also a great deal of information on how the events and actions of Alfred's life might or would have been viewed by his contemporaries in the Anglo-Saxon world.
The only flaw in this book is that the author doesn't spend as much time as I would've liked on the pros and cons of points of historical controversy. For example, while acknowledging that some controversy exists on the point, Merkle establishes the White Horse Hill in Uffington as the site of the Battle of Ashdown (Alfred's first great victory against the Danes) -- a position that's a fair bit more contentious than it seems as presented by Merkle. This same pattern is present throughout, and it's part of why this book is better suited for general audiences than for scholars. Still, though, Merkle does acknowledge the controversies even when he takes a firm position of his own, and he names sources so that readers who want more in-depth knowledge can seek out those alternate viewpoints on their own.
This is a work of general-audience history, and general-audience history is always a bit of a gamble: I never know, when I pick up something by a new author, whether I'm going to learn any more than I would from a Wikipedia search, or whether (and this is always my hope) I'm going to get a genuinely detailed and evocative picture of the individuals' life and times. This particular gamble pays off; if you're not a scholar of the era, but still interested in this era of history, it's worth reading.