After a stay in a sanatorium due to violent behavior during an arrest, Detective Karl Jørgensen is transferred to the fraud department. Here, Karl discovers a case involving his ex-wife and her new husband. When Karl begins to investigate the case, he is stopped by the police chief. Karl teams up with journalist John Bullnes. They gradually get closer to the truth, but are stopped when a suspect commits suicide. Karl is suspended and Bullnes is sent to Berlin on an assignment. Karl then takes the case into his own hands and arrests the city's mayor and a major contractor.