chunk: A "character marker," a set of spectacles: "while you wear them every one you meet will be marked upon the forehead with a letter indicating his or her character. The good will bear the letter 'G,' the evil the letter 'E.' The wise will be marked with a 'W' and the foolish with an 'F.' The kind will show a 'K' upon their foreheads and the cruel a letter 'C.'"
  Over the next two weeks, Rob experiences adventures exploring the use of the Demon's gifts, but eventually concludes that neither he nor the world is ready for them. On the third week, Rob rejects the Demon's gifts and tells him to bide his time until humankind knows how to use them. The Demon leaves. With a light heart, Rob concludes that he made the right decision.
  Like some of Baum's adult novels, The Master Key features encounters with real historical figures of the period, such as King Edward of Britain, President Loubet of France, and the Duke of OrlĂŠans.