The mischievous schoolgirls travel by coach to Europe, accompanied by a wanted jewel thief dressed as a woman, and an undercover police detective. Comedy, starring Lionel Jeffries, Joyce Grenfell, Terry-Thomas, George Cole and Alistair Sim.

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.