Sasha has never encountered anything worse than moving from her beloved hometown... Will new classmates replace old ones? What about friends? Will there be truly good friends... It is unknown how Sasha’s life would have turned out if not for an accidental discovery... A mysterious chest in a dusty attic, what secrets does it hide? Mysterious notebook... Old cassettes from the times of the USSR... The latter is perhaps very interesting. Especially after getting to know them among classmates. Cassette... Each one contains a riddle, a real Soviet quest! Will the guys and Sasha herself begin the search? Of course! But is it safe? Will children's fun become a threat to the lives of classmates? Who knows... But nothing brings us together as much as joint adventures! If only everything ends well!