The girls of St Trinian's, along with their headmistress Miss Fritton (Rupert Everett), successfully steal The Girl With One Pearl Earring, fence a fake copy to Anabelle's traitorous father, return the original to the museum and claim a reward. They are thus able to save the school from financial ruin.
They also manage to win the Question Time competition they entered into as a cover, thus thwarting the attempts of the Minister of Education (Colin Firth) to have them shut down for their anarchic ways.
Miss Fritton and Minister Geoffery reunite their old love affair, and the press catches them.
Thanks Mary C!