The documentary series following life at Harrop Fold School returns three years on, featuring a new generation of year sevens who already have a reputation among staff members for mischief. The new series also catches up with youngsters from the 2017 series, who are now moving into year 10. The school is on high alert after a member of the public calls in, claiming to have seen a pupil with a knife, forcing Mr Povey and his staff to instigate bag searches.

Year eight student Rani decides to play a Valentine's prank on his best friend Jack, but the strength of their friendship is put to the test after an incident in the playground. Meanwhile, the search to find the new head girl concludes and the winner is finally revealed to staff and students, and year 11 pupil Chelci has a falling out with best friend, Cheyenne.