Participants of the New Year's carnival began to dance. And suddenly the festive noise was drowned out by a woman’s scream. The dancers parted. In the center of the lobby lay a man dressed as Dracula. A pool of blood flowed from under the body, an abandoned pistol lay nearby... Lera did not understand what was happening in their business center "Presnya Palace": first an accident with her friend Rita, now the murder of her boss Shostok... There was only one clue: a piece of old wallpaper , clutched in the hand of the dead Rita. About thirty years ago, similar wallpapers were found in Moscow apartments... The house on Trekhgorny Val turned out to be almost uninhabited. One of its last residents said: many years ago, in a room with green wallpaper, a woman whose child was kidnapped hanged herself. Is the death of Rita and Shostok really a consequence of this forgotten story?.. And soon Lera received an envelope with a piece of dark green wallpaper...