This exciting book is about the terror that swept through the Russian Empire in a bloody wave at the beginning of the last century. The hero of the book is the legendary Yevno Azef, who incredibly combined the leadership of the Social Revolutionary Combat Organization and service as a secret agent of the Police Department. For the first time in world literature, Azef appears not as a “fiend of hell,” but as an intelligent and prudent fighter against terrorism. The book is written on the basis of archival materials, is very informative, useful to everyone who is interested in Russian history.