Please bear in mind that this book was written in 1953 as the author refers to the Hawker Hunter F2 as being on the "secret" list and therefore can't say much about it!
Neville Duke was a WW2 fighter ace who shot down over 20 enemy aircraft (confirmed). The fist half of the book deals largely with his childhood and early years in the RAF as a fighter pilot. He was assigned a test pilot role after 3 tours as a front line combatant and was involved in the development of several significant aircraft. Duke was also involved in several high speed record breaking flights including the setting of a world record in the Gloster Meteor. He then works for Hawker as a test pilot after leaving the RAF.
Generally the early years and WW2 are covered in better detail than the later test pilot years and I found myself wanting more detail on the aircraft and flying. This is typical of books written in the 1950s & 60s.
Nonetheless, a very good and interesting read if you are interested in aircraft of the 1940s & 50s.