While jogging, entrepreneur Lars Fresinger stepped on a mine in the Cologne city forest and bled to death. Max Ballauf and Freddy Schenk suspect a terrorist background. That is why the LKA and the state security service, led by Eva Bertsch, also get involved in the investigation. The first indications of the crime are quickly found. Fresinger was a board member of the "Land instead of mines" foundation, and he maintained close business relationships with his machine company in Africa. It was here that he met his wife. Fátima Fresinger comes from Angola, a country riddled with mines after many years of civil war . She is rather closed to the commissioners. Her friend, the nurse Hannah Siems, who worked in Angola for a long time, seems to know more than she is letting on.
Another trail leads Ballauf and Schenk to the "Wieland Schauff Society for Ordnance Disposal" and the obscure explosives expert Lothar Raschke. The mine that killed Fresinger was an old model that has been out of production for a long time. Then a call from Fátima Fresinger startles the inspectors. A package was delivered to her house – without a sender.