Double disclosure: the author is a friend of mine, and my name is in the acknowledgements of this book.
Moving Target: The History and Evolution of Green Arrow represents an incredibly deeply researched history of one of DC's most enduring but often under-utilised heroes.
Gray offers both fact and analysis and pairs them with far-reaching interviews with a wide variety of people tied to the history of Green Arrow, many of whom reveal far more than one might expect. The people who have worked on Green Arrow have obviously been passionate about the character, and that passion is reflected in both their own words, the work itself and Gray's analysis.
Gray is not afraid to illustrate that Green Arrow's catalogue has not always been a a cavalcade of quality, and his asides about the history of DC itself in relation to the character are invaluable.
If you want to know what primary colours combine to form Green Arrow, you likely cannot do better than Moving Target. Moving Target fills a niche you may not have known existed, but if you're an Oliver Queen diehard or a fresh recruit to the cause of the Emerald Archer, this is a more than worthy addition to your quiver.