F.W.Winterbotham grew up in the vanished age of the British Empire before 1914. He volunteered as a soldier at 17 and became a prisoner of war. before 1939 he played a valuable intelligence role in Germany. When war broke out he became an MI6 agent and the mastermind of the "Ultra" miracle that decoded wartime German communications. He was at Churchill's right hand during some of the most important and secret decisions of the war. This book tells his story.