This is an unusually interesting and important review of the development of radar and electronic warfawe in WWII. It was written by the person who is considered, and rightly so, the father of modern electronic warfare, and who had personally made a key contribution to its development. In the turn of the 21st century, it is astonishing to see that although R. V. Jones had acted in WWII with technology of those days, most of the concepts and techniques dealt with by him still hold true to this very day. This is a rare monument to the group of people who had made an enormous contribution, through their most secret effort, to the defeat of the Nazi beast. I highly recommend it to anyone who is interested in the history of this field.