The fourth form monsters’ latest trick is their best ever – they have burned down St Trinian’s school! As the girls stand trial, the police breathe a sigh of relief, but miraculously the judge’s infatuation with a student means the school is freed. For the authorities, it means a new reign of terror as the girls of St Trinian’s regroup with gleeful anticipation.

With their headmistress under lock and key in her majesty’s prison, the St Trinian’s girls find themselves under the protection of the army. However, when the sixth form take a fancy to winning a trip to Italy through means fair or foul, the army discover this is one battle they can’t win. Let loose in Europe, it is not long before St Trinian’s have succeeded in endangering European relations.

The all-girl school foil an attempt by train robbers to recover two and a half million pounds hidden in their school.

When their beloved school is threatened with closure should the powers that be fail to raise the proper funds, the girls scheme to steal a priceless painting and use the profits to pull St. Trinian’s out of the red.

Story of manic schoolgirls who are more interested in racing form than books as they try to get-rich-quick, aided by the head-mistress’ brother, played by Alastair Sim, who also plays the head-mistress.

The girls of St. Trinians are on the hunt for buried treasure after discovering headmistress Miss Fritton is related to a famous pirate.