The race for the thirty-nine keys continues, and the winner will gain unprecedented power and rule over the entire world. 14-year-old Amy and her younger brother Dan, together with their companion Nellie, travel to different countries, solve riddle after riddle, show remarkable courage and risk their own lives. The tombs of the pharaohs in Cairo, the legendary Amber Room in Russia, the underground city of Coober Pedy in Australia - with each new adventure they are getting closer and closer to the finale.