There is an old saying to the effect that quantity has a quality all of its own, and this was never proved better than by the performance of the Hawker Hurricane during the Battle of Britain. While the Hurricane was slower than the Spitfire - and the German Bf109 - it was rugged, stable, and best of all, available in numbers. While the Spitfire was without a doubt the better plane, it was difficult to build and repair, while the Hurricane was comparatively easy to construct - while it looked a modern monoplane fighter, it was built in the fashion of the older planes of the early 1930's.
McKinstry follows up on his earlier studies of the Spitfire and Lancaster, subtitiling the volume "the plane that won the Battle of Britain". That assertion is at least arguably correct: without the Hurricane available in numbers, with Spitfire production lagging behind orders, the outcome in 1940 might have been different indeed. But it is also clear that 1940 was the high-water mark for the Hurri as a fighter plane": after that it was used as a ground attack plane with tank-busting cannon, bombs and rockets, and in theatres outside Europe, such as North Africa, Malta and Burma, and as a catapult plane fired off merchantmen in the mid-Atlantic with no landing strip to return to!
Most of this book is about the Battle, and the role the Hurricane played. Prior to that, its development is run through and post-1940 the story is one of decline and obsolescence, at least in the role it was designed for. There are testimonials from pilots about the reliability and sturdiness of the Hurrincane, to which many owe their life. Some pilots preferred Hurricane to Spitfire, and explain why. There is also a bit of the Spitfire snobbery of German pilots exposed - if a single engine plane got you, then it must have been a Spit! Of course, this is true of every soldier since primitive man picked up clubs: in WWII allied troops reported every tank as a Tiger, and each artillery piece an 88.
This is a useful book on the Hurricane, and is just long enough. Hopefully the role of the Hurricane in 1940 will never be forgotten or ignored in favour of the more glamourous Spitfire.