…After the final exams at a regular school, three schoolchildren understand that they have not passed the exams, and it can break their future career. Fraudulently the teenagers enter the house of their teacher Yelena Sergeevna and demand the key to the safe in which the examination papers are stored. At first, schoolchildren try to persuade Yelena Sergeevna, then they come to bribery and blackmail. But the high-minded teacher does not agree to the deal with her conscience and tries to explain to her schoolchildren all the meanness and baseness of their actions ...