A drone discovers the body of a dead person lying on the platform of an abandoned station on a long-disused branch line. All around is now just impenetrable bushes. Where did he come from? Did he fall from the sky? A complex search in inaccessible terrain and the patient compilation of found clues begin. There are several questions to be answered: Who is the dead man? Why did he find himself here? Is there any connection between him and the place of discovery? Hladík's mordpart has no clear point to bounce off of at that moment. In addition, the fact that the place of discovery was part of a secret and strictly guarded area during the war also brings a big complication. Many adventurers tried to find treasure or at least war documents in the area, left by the fascist occupiers. It turns out that the complexity of the search is much more extensive than it initially seemed. And everything accentuates when, in the immediate vicinity of the discovery of the dead, in the bombed-out factory, a dungeon with the remains of prisoners of war is discovered. Will the Prague criminologists, in cooperation with their Parisian colleagues, succeed in uncovering the whole truth?