The jeweler Karl De Mestre had imagined the celebratory reception for his company anniversary differently. The stylish festival for the better society in Cologne is disrupted by globalization opponents from the activist group "Underworld". They accuse De Mestre of earning his money with diamonds from civil war zones. Suddenly a shot is fired. The activist Andre Hesse is shot at close range. The commissionersMax Ballauf and Freddy Schenk take on the case. It quickly becomes clear: a professional was at work here. Did Hesse have to die because of his commitment against the so-called blood diamonds? Could De Mestre himself be behind the murder? A trail leads Ballauf and Schenk to the Belgian diamond metropolis of Antwerp. They decide to investigate there on their own and thus put their lives in danger.