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. 1982. Soviet scientists are developing a new combat flamethrower system. Western intelligence services manage to recruit one of the participants in the project - scientist Alexei Poplavsky. The KGB becomes aware of this. Sensing danger, the traitor leaves for a symposium in Germany and remains abroad. A group of Major Mikhail Koltsov is sent to search for the fugitive. Suddenly it turns out that the safe houses on the other side have failed. The operatives find themselves in a difficult bind, from which they can only get out of it and successfully complete the task thanks to a non-standard solution...