The Tragedy of the Korosko

The Tragedy of the Korosko is a novel by Sir Arthur Conan Doyle. It was serialized a year earlier in The Strand magazine between May and December 1897, and was later turned into a play Fires of Fate.   

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.