The film is the latest in a line of six films, starting in the 1950s, focusing on the dysfunctional girls’ school of St Trinian’s and the adventures (or misadventures) of the students and teachers in the institution. This film departs from its predecessors by being a reboot of the entire series instead of a sequel, like the others were.
Annabelle Fritton is admitted to St Trinian’s, where she initially finds herself out of her depth. She is led around by an older girl who tells her about all the cliques, including the Emos, Geeks and ‘Posh Tottys’. She is bullied by the other girls in her dorm, with a particular prank resulting in her being covered in feathers. Drafted into the school hockey team after her father refuses to take her home and she throws a huge tantrum, hitting her phone across the lobby with a stick and destroying a marble bust, Annabelle soon realises that this school is void of any normalcy.
The girls soon strike a deal with a shady man named Flash Harry to brew vodka in the school lab, but this is thwarted when the Education Minister (played by Colin Firth) pays them a visit. His daughter Verity used to bully Annabelle back in her old school, which also happens to be the rival school of St Trinian’s. He discovers various horrifying breaches of the law in the school, for example the homemade vodka, which is terribly strong and knocks him out. He vows to shut down the school, and is thrown into a fountain.
Unfortunately, the school has other problems, and the bank pays a visit to tell them that they will be shut down if they do not pay their debts. Annabelle’s father Carnaby reveals that he never liked her, and tries to sell off the school. Outraged, the girls decide to steal a famous painting to raise the money. They make Flash Harry stand in as a fake art dealer, dupe Carnaby into buying a fake painting, then steal the real one and return it to the authorities for a further monetary reward. The school is saved and the girls continue studying there, with Annabelle now a ‘true St Trinian’s girl’ after the girls give her a gothic makeover.
Colin Firth plays the Education Minister, Geoffrey Thwaites whose daughter is studying at Cheltenham, a posh girls’ school who is the rival of St Trinian’s. His character is revealed to have had a romantic relationship previously with the headmistress of St Trinian’s, who is a transvestite. He is knocked out by the vodka that the girls made after seeing one of them trapped in a tank of formaldehyde in the science labs, and later one of the Posh Tottys throw him into a fountain.
Firth plays the nasty character of Mr Thwaites very well, and though the movie was criticised for being overly camp and ‘a zoo’, Firth was staunch in his performance as a dedicated father and archetypal boarding school villain, and praised by many viewers for his comedic part alongside Russell Brand, who played the duplicitous dealer, Flash Harry.