Her father has been dead for 15 years, but the unexplained murder leaves Commissioner Ann Kathrin Klaasen alone. Her colleague Frank Weller urges her to go to the doctor. In practice, she experiences a fist-thick surprise: in the waiting room she sees a photo of her own father in the wallet of an old lady, together with a completely unknown to her Woman. Even though Gertrud Klocke affirmed that the man in the photo is the fiance of her late daughter, there is no doubt for the Commissioner. Ann Kathrin cannot forget the encounter. Therefore, she visits Ms. Klocke again in the senior residence, but finds the old lady lifeless in a beach chair.