Set in Nutbourn College, the most established and respectable of boy's schools, a military mistake billets a girl's school to share the college's premises, to the outrage of their horrified headmaster and headmistresses. Initially the two are hostile to one another. However, with a staff of dazed, eccentric teachers and a student body of knowing and troublesome children, they are forced to pull together as the situation stumbles from the sublime to the ridiculous.