Filcher, a member of gang of pickpockets, steals Marian's book about the Philosopher's Stone, thinking it holds the secret to changing lead to gold. Unfortunately, none of the thieves can read, so they kidnap Lady Rohesia to explain the book's details. Robin and his friends attempt at a rescue are hindered when Marian's bungles her magic spell, resulting in the young magician changing bodies with one of the crooks. Now Robin must not only locate the missing noblewoman, but help Marian get back into her rightful body before they can save the day.