Police Inspector Dadlib continues to try to figure out who (what person or group of people and what is their criminal intent?) is hiding behind the Yi Peng trademark. This time he has to act deep underground - alone, without any reliance on the police and army of the city of Tumpstown. Life is not without good people, and the inspector gets assistants - the stupid hacker Zhuzhu Tsutsulkevich and the yaurei Polikarpych, famous for his wisdom. But they are no less trouble than help...