World-renowned crime expert Drongo has been invited to the Frankfurt book fair - he has been asked to present a controversial book about drug dealers to the public. But on the eve of the presentation, an expert accidentally discovers the body of a man with his throat cut in the pavilion toilet. The German police, having learned who Drongo is, immediately involve him in the investigation. A small publisher from Mainz was killed. However, it quickly became clear that, in the recent past, a citizen of Serbia, he participated in the war in the Balkans. Drongo is sure that the crime is somehow connected with the combat past of the murdered man. He is also confident that he will quickly find the killer. But he doesn’t know anything else: this time it’s better not to look for the killer...