Wiesbaden. Prosecutor Angela Bennefeld is found dead in the Schierstein harbor. Everything appears to be an accident, but her stepmother does not believe it and asks private investigator Norma Tann for help. Norma reconstructs Angela's last evening. She comes across documents regarding the glycol wine scandal of 1985, which spelled disaster for many winemakers. More and more details from Angela's past come to light as the private investigator delves deeper: Angela's murderer finds themselves in a tight spot - and Norma is in mortal danger.