Wolf Eppenstein, a Russian German who visited the homeland of his ancestors, dies in Bavaria. Who could be bothered by an unknown Russian? Twenty years later, his son's life is also in danger. Who is hunting this family and why? The younger Eppenstein and Bavarian police investigator Lieutenant Colonel Schlosser are trying to find answers to the questions. Will the medieval legend of Lohengrin help them? And perhaps the “fairy-tale king” Ludwig the Second of Bavaria himself will reveal secrets hidden for centuries.