The team of the elite gymnasium in the regional center is preparing for September 1st. The new director, a former test pilot, has already promised to weed out the ranks of honored teachers, and to fill the empty seats with discipline in tight blouses. For Russian teacher Nastya Popova, this is completely inappropriate - at school she takes a break from family happiness, which, after the arrival of her mother-in-law, has nowhere to turn around. Her colleagues also have something to lose. A handsome chemist, a mysterious Russophile millionaire and a girl with a bell give the former aviator a “black mark”. The war with the presumptuous newcomer ends at the most interesting place: while the entire teaching staff is looking for teeth that have fled into the sewer, the pilot delivers a fatal blow. He doesn’t know that behind the hawthorn bush the mistakes of his youth are already waiting, and the blow turns into a miss...