So, Katharina, the game begins. From now on, you will receive a daily question from me regarding the life of your colleague Benjamin Rehder. For each wrong answer, I will punish Benjamin. How, I leave to your imagination. There are still twelve days until Christmas Eve. In the midst of the Christmas hustle and bustle, Chief Inspector Benjamin Rehder disappears without a trace. His colleague, Inspector Katharina von Hagemann, suspects that he is in great danger. Suddenly, she receives an anonymous invitation to a macabre game. Inevitably, she begins to investigate his private life and discovers things she would rather not have known. Will she manage to save Rehder's life?.