A corpse of a fugitive Russian oligarch is discovered in a private mansion in France. A little later in Saint Petersburg, at a party in the house of a major businessman, a woman dies from poisoning. In both cases, one detail appears: a playing card. It turned out these people had nothing to do with each other, and the homeowner insists that they wanted to kill him. Soon the murders continue, and at each crime scene, the police find a playing card again. The third book in the investigations by investigator Sergey Shaposhnikov.