An assassination attempt has been made on a major Russian oligarch. They tried to kill him in a very sophisticated way: the criminal treated the oligarch’s bed linen with a potent poison. It was enough for the oligarch to go to bed - and death would have been inevitable. Very soon, the oligarch’s laundress died under the wheels of a car. Then a maid is admitted to the hospital with signs of severe poisoning... Frightened by how quickly death is weaving its web, the oligarch turns to the famous expert analyst Drongo for help. Having barely begun the investigation, Drongo comes to the conclusion: the criminal is part of the oligarch’s inner circle. He begins to methodically interrogate his younger brother, wife, son, daughter, the oligarch’s driver and does not immediately notice that death is already breathing down his neck...