 Monica smartly deduces Liz's claim, and she coaxes Liz into giving her a ride around town to fix her hair, replace her outfit, and take her to get driving lessons in exchange for the necklace.Prom day goes from bad to worse as the pair is pursued by Pierce Peters, an intelligent British jewel thief who is also pursuing the diamond to give it to a buyer.Meanwhile, Monica finds that she cannot get an appointment to fix her hair or replace her dress and shoes.