The enemy is smart and cold-blooded. His arsenal includes logic, perseverance and precise calculation. He is confident that he knows how to defeat us in this fight. But the enemy does not take into account one thing: standing in his way are super-professionals in their field, people of risk, honor and unbending will - Soviet counterintelligence officers.

The CIA manages to identify the hidden positions of Soviet ballistic missiles. The KGB leadership is confident that the Americans were helped by one of our technical personnel. Major Mikhail Koltsov's group is tasked with identifying the traitor. However, the start of the operation almost turned into a failure. Two exposed agents directly related to the case die at the hands of the killer. Sensing surveillance, one of the high military officials takes his own life. Koltsov himself almost dies in a fight with a suspect... Finally, the operatives manage to detain a valuable witness. After his testimony, it becomes clear: the “mole” must be looked for in the dense Belarusian forests. It is there, in a secret military unit, that counterintelligence officers will face a decisive battle with a seasoned enemy...