A scientific conference at the Research Institute of Neurology turned into a tragedy: the main speaker, Professor Fokin, died in front of a large audience. The body of the researcher was urgently taken to the forensic center, where it turned out that Fokin was killed by poisoning with a potent poison. The management of one of the capital's television channels became interested in the death of a prominent scientist. Crime reporter Aristarkh Rusakov is tasked with conducting a journalistic investigation and finding out who benefited from Fokin’s death. Rusakov gets down to business with passion and soon comes to the conclusion that the murder may have been committed by the professor's ex-wife...