When the troublemaking girls of St. Trinian's discover that their headmistress Miss Fritton (Rupert Everett) is related to an infamous pirate, they square off against the evil Pomfrey (David Tennant) and his menacing group of woman haters on a hunt for buried treasure. Colin Firth returns as stuffed-shirt education minister Geoffrey Thwaites. Gemma Arterton and Russell Brand also star in this adaptation of the work of cartoonist Ronald Searle.