The monstrous St Trinian's schoolgirls with their headmistress, Amber Spottiswood, are on the move again. This time to Hamingwell Grange. But the Great Train Robbers have got there before them - and left £21/2 million hidden under the stage. Desperate to retrieve their loot the train robbers pose as caterers at the school Parents' Day, but they have not reckoned with the ferocity of the unbeatable girls of St Trinian's!