This document introduces the characters that live in or are visiting Elizabeth Mc Donald's large, comfortable home. The characters include Elizabeth, her young granddaughter Lisa, the pilot and flight attendant accompanying Elizabeth on a trip, the chef, butler, Lisa's new teacher, an architect and his assistant who are there to do repairs. It's revealed that a valuable jewel owned by Elizabeth is stored in a secret room in the home. The next day, Lisa falls ill after eating an apple pie and a doctor and chemist are called to treat her. That night, strange noises are heard but ignored. The following morning, Lisa discovers the jewel has been stolen. She calls detective Sherlock Holmes for help in solving the mystery.