Oath Bound - Book V of the Order of the Air

Aces high…As the threat of European war looms, the Kingdom of Ethiopia is one of the first to come under attack from the Fascist powers. When Dr. Jerry Ballard's long-anticipated dig in Alexandria is interrupted by the arrival of his old friend Iskinder on a secret mission for the Ethiopian Emperor, Jerry has to make a stand — even if it means delaying his dream of finding the lost tomb of Alexand...