The Decisive Duel – Spitfire vs 109 seeks to examine the development and operations of Spitfires and Me 109s side by side for comparison, and this is more or less expected from the title. Indeed, more than half of the book is devoted to the period 1940-1942 when both types were locked in regular combat firstly during the Battle of Britain and later during offensive operations over France. The ‘decisive’ aspect is, arguably less relevant in descriptions of air fighting over Europe from 1943-1945, as the German Air Force was decisively decimated by the actions of the USAAF P-47s and P-51s in that time. Decscriptions of Spitfire operations in the Far East, whilst interesting, seem a digression from the title. There is also some attempt to compare the idealogical differences that shaped the development of the aircraft. The book draws on a huge number of sources, all properly referenced to profuse notes at the end of the book. In spite of that, a few errors do creep in. 32 well selected photographs are marred by four significant caption errors, and one reversed image. Flaws aside, this is an enjoyable read for anyone interested in WWII aviation.