I have been interested in the 1940 campaign for many years now and this is reflected in the contents of my bookshelves. While other books have come and gone, however, one gets re-read about once a decade and referred to frequently. So if you only ever read one book about this period make sure it is Mr. Horne's finest. After delving deeply into the background to both the war and the state of it's protagonists, a detailed yet very readable account of the campaign itself. It is, and is likely to remain one of my top ten books!
During the conversation at Shrivenham, a couple of people recommended this book. I've only just begun reading it and so far the author is addressing the concept (was there one?) and overuse of the word 'Blitzkrieg.' So far so good.