Polina Averina decided to answer an advertisement in the newspaper with no friends, no job, and nowhere to live. She didn’t know that behind the door of the house she’d dreamed of were crimes, love, shattered hopes, and a mysterious order. In that house, she will come face to face with riddles, secrets, and dangers connected to its previous resident. What does the owner of this house hide? Will private detectives Makar Ilyushin and Sergey Babkin help her? And will the final door in this house open for her—or are some secrets better left undisclosed?