The only witness is only eight: When the Habdank family's house is broken into in the middle of the night, little Anna is able to hide. Shortly thereafter, her younger brother and her mother are dead. Inspector Max Ballauf finds the girl hours later in the basement of the house. Anna is in shock. She doesn't want to talk about what she experienced or saw. Freddy Schenk asks his colleague to proceed cautiously with the investigation. The girl first finds accommodation with her aunt Hilde and her husband Gunnar. Even Anna's father Sven Habdank, who has just returned from a business trip, is hardly available to the inspectors.
Does the assassination attempt on the family have anything to do with his job? Habdank is a tax auditor and is considered by his colleagues to be a "tough dog who bites his teeth": Both the journalist Ole Winthir and the building contractor Pit Benteler, who had to disclose their accounts, are not on good terms with him. Or is it more like murder out of jealousy? There was obviously tension in the relationship between Sven Habdank and his partner Freya. Was there something going on between Sven's brother Michael and Freya?