A new top-secret vaccine has been produced in a Russian laboratory that can treat several strains of so-called combat viruses at once - those created by human hands. But one of the laboratory employees has turned out to be a traitor and is trying to sell the formula to neighboring countries. Vlad Artemev, an employee of the Russian Foreign Intelligence Service, learns about this. He begins searching for the traitor, trying to get ahead of spy groups from other countries.