In a remote valley on the karst, an unclothed male corpse is discovered. The autopsy report reveals: death by asphyxiation. Once the deceased is identified, it quickly becomes clear that he had frequently met with Mia, a young Australian woman. Mia is handling an inheritance for her family, which includes a warehouse that, to Mia's surprise, is filled to the ceiling with old weapons. In Commissioner Laurentis's fourth case, the investigation once again leads back to the turbulent political past of Trieste. Not only petty criminals but also high finance from across the border and colleagues from the Italian secret service disrupt Laurentis's circles.