John Blair's piece of work is, as the title hints, a quite short introduction on England/Wales history between 5th and 11th centuries. Far from being an easy task, the lack of historical data makes any attempt to write down this narrative quite toilsome, and, sometimes, even impossible. Nevertheless, the author does not only present an enlightening summary on those less, or even unattested years, but points out clearly what we do know and what we do not know, based on historical sources and archaeological data.
Indeed, the book does not aim to provide a comprehensive narrative on those six centuries of history, rather, limits itself to a shallow introduction of the reader on the subject. In doing so, the author just avoids going deeper on almost every topic, aside Viking invasions and Wessex history in 9th-10th centuries.
Of course, one trying to find a more thorough analysis should not glance over a self-entitled very short introduction.