At a New Year’s carnival, the participants whirled in a dance. And suddenly the celebratory noise was cut off by a woman’s scream. The dancers parted. In the center of the lobby lay a man dressed as Dracula. A puddle of blood had leaked from under his body, and a discarded pistol lay nearby… Lera didn’t understand what was happening in their business center “Presnya Palace”: first there was the misfortune with her friend Rita, and now—her boss Shostakov’s murder… There was only one clue—a scrap of old wallpaper held in the dead Rita’s hand. Thirty years ago, such wallpaper was common in Moscow apartments… The building on Trehgorny Val turned out to be almost uninhabited. One of its last residents said that many years ago, a woman hanged herself in a room with green wallpaper, after her child was stolen. Could Rita’s and Shostakov’s deaths be the result of that story everyone has long forgotten?… And soon Lera received an envelope with a scrap of dark green wallpaper…