The film tells about the fate of Professor Felix Beloyartsev, who worked together with colleagues on the creation of the drug Perftoran, which was called "blue blood" by journalists. Work on Perftoran was accompanied by intrigues in the scientific community, interest in "blue blood" by Western experts, and, finally, attention to the scientific development of the all-powerful KGB. As a result of the information war, the work of Beloyartsev's laboratory was suspended. In 1985, the 44-year-old professor hanged himself, leaving a suicide note "I can no longer live in conditions of slander and betrayal."