The book reflects in a fascinating artistic form the activities of our contemporaries - domestic counterintelligence officers - to counter foreign intelligence services and protect the most important state secrets. The 13 essays are based on materials from 13 operations carried out by the Russian FSB in recent years to identify and expose spies. The author, using rich factual material, introduces the reader to the multifaceted work of domestic counterintelligence, focusing on the names of those who ensured the success of operations with their hard and creative work.