The son of the head of a major corporation, Yegor Bogdanovsky, died due to an exacerbation of an ulcer - at least, that’s what doctors say. Relatives, including famous politicians, influential businessmen, and actors, do not believe this and turn to the expert analyst Drongo with a request to conduct an investigation. Drongo is the best in his field, but even he finds it difficult to work among those who are accustomed to power and permissiveness. All his versions - revenge, jealousy, envy - are refuted along the way. He is ready to admit defeat, but a mere trifle, just a few words in a conversation, suddenly determines both the motives for the crime and the killer himself...