Shortly after opening time, a man goes on a rampage in a Hamburg supermarket. Inspector Sarah Kohr is quick to arrive on the scene, supporting the unsettled patrol officers and pushing the gunman, who is dressed in military uniform, from inside the store into a back room with no possibility of escape. Here, the uniformed perpetrator Lars Mittmann apparently commits suicide. But his suicide raises questions, especially since he apparently decided to commit this terrible act on his daughter's birthday. In addition to a few slightly injured passers-by, IT specialist Malik Otark is the only other fatality.

With the help of military police officer Patrick Beikamp, who has since arrived from the neighbouring barracks, Sarah Kohr puzzles over the motive and course of the rampage, without really revealing her conclusions and insights. But with him, she has access to the barracks. The fact that the death of IT specialist Malik Otark was no accident and that the commander of the Intervention Forces Command (KIK), Christian Fesek, is in favour of a conspicuously quick conclusion to the investigation in order to protect his unit on the premises , our inspector is slowly beginning to see an opaque web of soldiers, retired people and accomplices throughout the republic who have their own idea of how the country should be saved...