The protagonist is investigator Durov. A head wound puts an end to his police career. Durov is promoted to director of the district police museum. But his "combat" past keeps him busy. Now he investigates, of course, unofficially, the cases written off in the archives. Thus, after his injury the main character starts to exist in two planes, as if living two lives. The first - the events of objective reality: work, friends, love. The second life subjectively flows in the hero's head. In it Durov constantly gets to the past, where he becomes a direct participant of the events, with which Durov's first archive case is connected. 1944. German concentration camp. The Germans execute the underground hero Luzhin in front of the prisoners of war. All facts point to the fact that Luzhin was turned in by his fellow soldier Kayurov. But is it fair that Kayurov was labeled as a traitor all his life. And if not Kayurov, then who. This is what Durov will have to find out after he goes through all the ordeals together with the heroes of military events.