At all times, intelligence and counterintelligence were a secret occupation, only a few were devoted to their subtleties. We do not know all the secrets of the Roman special services and will never know. However, thanks to the surviving works of ancient authors and the analysis of data from archeology, numismatics and epigraphy, one can see quite clearly the general picture of events, and sometimes specific episodes. Based on scientific data, the author of the book, Vladimir Dmitrenko (formerly a military intelligence officer, an analyst of political and economic information), sometimes comments on events, puts forward his hypotheses and assumptions, but nowhere resorts to fiction - the real story of intelligence and other secret services of Ancient Rome is much more interesting than any fiction.