The Golden One is by Elizabeth Peters. It's 1917 and as WWI continues, the Emersons decide to move to Egypt and stay for the duration since travel between Egypt and England is made dangerous by German submarines. Once they arrive events conspire to lure Ramses back into the espionage business. He and the family must travel to the besieged city of Gaza to rescue Sethos, who may or may not be a double agent. Fans of the series will love this installment as well. The ending is especially touching and sets up the next crises nicely.
Ratings: 9th grade - 9 of 10 - P (profanity) - V (violence) - AC (some mature thematic content).