This book starts with Prussian troops circling Paris in 1870. The author then painstakingly covers the development of British politics up to 1939, putting the blackshirts, and other movements, in historical context. It is therefore somewhat thin on detail of the blackshirt movement, but is innovative in doing what the author sets out to do: show that the BUF was a logical progression of the political trends of the time, not, as many other supposedly authoritative books often present it, a baffling fluke of political history. In that objective it is successful. For detailed information about the movements themselves, this is perhaps not the book to read. It's not badly written, just badly promoted (like the title, for example).