About the book: 2022 / The meeting of graduates of the school, which Colonel Gurov’s wife once graduated from, promised to be warm. But in the midst of the fun, tragedy struck. History teacher Oleg Shlitsman was found dead in one of the classrooms. The examination established that the cause of death was poisoning. But who could do this, because there were only people at the holiday? Detectives Gurov and Kryachko are in a hurry to identify the criminal without delay. But the matter suddenly turns out to be much more complicated than it seems at first glance. And the historian Shlitzman is only the first victim in a long list of an unknown villain…