Professor Razumov was beaten to death not far from the institute where he taught history. The police recognized the case as a case of wood grouse: it turns out that the culprits were random passers-by. Go find them! The closest circle of the murdered man inspires complete confidence. The version that his colleagues were involved in the murder of the professor has to be abandoned. Razumov’s student Vlad Neznamov, who arouses suspicion with his exaltation, also could not commit the crime due to his physical frailty. And then private detective Tatyana Ivanova, who, at the request of the inconsolable widow, took up the investigation, discovers some facts that depict the victim of unknown vandals from a completely unexpected angle...