This book details the creation of the Special Air Service, a part of the British Army. It was founded in 1941 by David Stirling. While much of the information about the Special Air Service remains classified due to their special forces operations, this book provides a decent history and accounting of some of the activities undertaken by the SAS during World War II. The SAS supported many operations on the ground during the war, embarked on a disinformation campaign, intelligence, and other activities. I didn't know much about the SAS prior to reading this book, but it was full of good information. I enjoy this author a lot and have read several other books by him.