A letter from his godchild Grete conjures up the ghosts of the past for Inspector Borowski. Four years ago, Heike Voigt disappeared. She was a friend's wife. Her husband Frank Voigt was suspected at the time and acquitted for lack of evidence. In the letter, Grete asks her Uncle Klaus for help. She lives with her sister Sinja, her father Frank and his new partner Anna in a villa in the country. When Borowski visits the Voigt family, Grete denies ever having sent the letter. And something else is strange. Anna, the host's new wife, asks Borowski to stay the night: a ghost is said to be walking around the house. Is it Heike's ghost? Borowski doesn't believe in ghosts and wants to resume the investigation.
On the other hand, Borowski's new co-investigator Mila Sahin is very real! The 28-year-old specialist in operational case analysis has moved from Berlin to Kiel at her own request. She is competent, quick and promptly put in charge of the new investigation. Because Borowski is biased in the case of Heike Voigt. A psychological duel begins among old friends.