During her birthday party at home, Dr. Stephanie Bernsdorf catches her boyfriend Dr. Christian Mahler flirting with another colleague, Dr. Margit Rebelein. Short after the party end Dr. Bernsdorf finds Dr. Mahler severely wounded in the garage and brings him to the clinic where they work, but they cannot save him. Dr. Bernsdorf, who asked assistance to Dr. Franck, is then arrested with the accusation of murder, but Matula's investigations immediately show that Dr. Mahler was involved in something really sketchy.