Whitehouse de-romanticizes spying and his book includes much information about the exploits of zealous amateurs. This is a compendium of adventures in military intelligence. Spying is traced from the time of Moses (who sent twelve agents into the land of Canaan) through Caesar's invasion of Britain up to Benedict Arnold, the Civil War and World Wars I & II. Horribly enough, military intelligence today is often based on brainwashed collaborators. Sub rosa communication during atomic warfare will be quite taxing according to the author.