Miss Cullen finds herself in a dreadful predicament. Four years from retirement, she can no longer meet the educational standards expected nor control her pupils at Besley High School for girls. She knows that no other school will hire her now, but if she is sacked or doesn't work until she's 60, she will lose her pension. Her only hope is to hang on. But her poor exam results affect the standing of the whole school. Her colleagues embark on a campaign against her to save their own positions and she retaliates by involving the school inspector. Into this hostile environment comes Viola Kennedy, a young new teacher full of optimism and ideas, who instead gets caught up in the conspiracies and swirling resentments.