Who is Maria? World-class spy or collector of human souls? Guardian of Darkness or Mistress of Light? Is she a Witch or a Fairy? How could this woman be captured in a photo from the archives of a hundred years ago? What does it have to do with the events that took place in medieval Germany? And how can she, in a matter of hours, join an operation of the Russian special services, developed at the international level, and even impose her own plan of action? Is the heart of the man who loves her capable of unraveling this mystery? And what price will they both have to pay for love?