On the high seas in 1589, the famous pirate Captain Fritton released Lord Pomfrey, a nobleman from the upper class after a robbery. Pomfrey vowed to have revenge even if it took 420 years.
Back to the modern age, St Trinian's, an alternative school located in the suburbs of the country, opened for the new semester. The new student group is divided into: vulgar girls, combustibles, goths, fashion girls, geeks and ecological groups in response to climate change. The former eldest sister Kelly is now working as a spy. Miss Fritton, the headmistress, gave her niece Annabelle an unpopular job, asking her to treat those children and teenagers who were interested in weapons, equipment and stock trading but were lazy and didn’t like learning. We are huddled together.
Celia of the Eco Group was caught by her companion while looking for an ancient ring in the dusty school library. It turned out that the millionaire philanthropist Piers Pomfrey offered her a large sum of money in exchange for Fritton's heirloom, because there are clues to the pirate treasure.
Miss Fritton realized that this was a solution to St Trinian's long-standing funding problem, so she launched a comprehensive operation to find the treasure. Along the way, she was forced to rehabilitate her former admiration suitor Geoffrey Thwaites, and started a contest with a secret anti-female organization headed by Piers
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