A group of European and American tourists is enjoying its trip in Egypt in the year 1895. They are sailing up the River Nile in a "a turtle-bottomed, round-bowed stern-wheeler", the Korosko. They intend to travel to Abousir at the southern frontier of Egypt, after which the Dervish country starts. They are attacked and abducted by a marauding band of Dervish warriors. The terrorists will either kill them or forcibly convert them to Islam. This "desert drama" is high adventure at its pulpy best, and still surprisingly relevant today.