One night, the girls of St. Trinian's catch Celia, a member of the eco sect, retrieving an old ring from the school's Fritton Archives, who explains that an unknown man telephoned her to retrieve it for him in exchange for £20,000. Seeking to get more, Annabelle Fritton, the new head girl, demands £100,000 from the man when he calls back, only for him to refuse and threaten the girls for their greed. When the school's power is cut, the girls ask their headmistress, Camilla Fritton, about why the ring might be so valuable.