Such an Orthodox detective in a skirt has never happened before in the world! The secrets and crimes that Nina Sergeevna has to investigate out of curiosity, or even against her will, are secrets of a special kind. The wells of the past are dark and deep. The witnesses are dead, the facts are unreliable, even the documents sometimes lie. How to establish the truth? And what price will the heroine herself have to pay for the desire to know her?