The Belles of St. Trinians (1954)
The schoolgirls of St Trinians are more interested in racing forms than books as they try to get rich quick They are abetted by the headmistress brother
Blue Murder at St. Trinians (1957)
The girls of St Trinians School go on a bus tour of Italy chaperoned by a diamond thief disguised as a woman to elude the police