The son of the head of the largest corporation, Yegor Bogdanovsky, dies due to an exacerbation of an ulcer—at least, that’s what the doctors claim. His loved ones, including well-known politicians, influential businessmen, and actors, don’t believe it and turn to expert analyst Drongo, asking him to investigate. Drongo is the best in his field, but even for him it’s hard to work among people who are used to power and permissiveness. All his versions—revenge, jealousy, envy—are refuted as the investigation unfolds. He’s already ready to admit defeat, but then a mere trifle—just a few words in a conversation—suddenly determines both the motive for the crime and the killer himself…