The rich country house, which before the wedding seemed almost like a fairy-tale palace to Marianne, in fact turned out to be similar to Bluebeard’s castle. The young woman's husband died. She is a rich heiress, after two years of a painful marriage, freedom awaits her. But Marianne is hesitant to change anything, she feels that the real nightmare is just beginning. She is suspected of murdering her husband. And the midday demon, whom her legal husband was so afraid of, is somewhere nearby. But who is he? A supernatural being or a real person seeking revenge? Trying to save her life and sanity, Marianne discovers clues leading to the solution to the mystery. They are associated with the ancient legend of Lilith, an insidious temptress who drives you crazy with her fatal beauty.