The story of M. Kheifets is dedicated to the little-known wide circle of readers Narodnaya Volya N.V. Kletochnikov. This extremely honest and modest man set a rare example of a counterintelligence officer of the revolution. Following the instructions of the revolutionary center, Kletochnikov entered the Third Branch of the Imperial Chancellery - the so-called main police institution of tsarism to fight revolutionaries, and became a well-disguised agent of Earth and Freedom in the main headquarters of the tsarist secret police. Maintaining an incredible endurance, for two years he regularly transmitted to his comrades in the struggle information about the plans of the gendarmes and police officers.