The schoolgirls of St. Trinian’s are more interested in men and mischief than homework and hockey, but even greater trouble beckons with the arrival of two new students. Features Alastair Sim playing dual roles as the headmistress, Miss Millicent Fritton, and her twin brother, Clarence.
Henry Palfrey (Ian Carmichael) tries hard to impress but always loses out to the rotter Delauney (Terry-Thomas). Then he discovers the Lifeman college run by "Professor" Potter (Alastair Sim) and discovers the secrets of success.