Valera persuades her family to participate in a chess tournament. But, realizing her impotence in the game, Valera suggests to Katya to summon the spirit of the world chess champion: will magic help to win or lead to defeat? The Ivanovs are approached by a cabinetmaker who custom-makes chess pieces. An unusual damage was done to the man. The Ivanovs are helping to find out who wanted to prevent the master from working.