1993 Two murders were committed in one of the regional cities of Central Russia. At first glance, they are in no way related to each other, but they are united by one feature: they are made in a very specific way. The police are at a loss, since all the threads of the crimes stretch to the local medical institute. Is the killer wearing a white coat? And how, in this case, can the crimes committed be connected with the experiments carried out during the Second World War in the secret medical laboratories of Nazi Germany? Who will be the next victim? This whole incredible tangle of events, people and crimes will have to be unraveled by the captain of the criminal investigation department Olesya Sergeevna Kiryak. Walking along the very edge of the abyss of human cunning and cruelty, and sometimes being on the verge of death, she stubbornly investigates this complicated case. The criminal must be punished at any cost! Are you sure that you are ready to find out this dark TRUTH?