The internist Gisela Mohnheim is found dead in the Dortmund-Nord Clinic. She suffocated under a plastic bag. After a tour de force through the restless everyday life of the emergency room, clues point to a perpetrator from the hospital. In order to confront him, the Dortmund commissioners Faber, Bönisch, Dalay and Pawlak have to put themselves in danger in an unusual way...