In one ordinary school, where the most ordinary students and students studied, there was one very unusual and suspicious chemistry teacher - Kupriyan Semenovich (nicknamed Kuprum Es). It was because of him, or rather the elixir he invented, that strange incidents began to occur at school. Everyone obeyed the ordinary girl Zoya Ladoshina, from the director to the policeman. How this could have happened, why and how the story ended - find out together with the heroes of this fantastic story.