Classicly

Nick Carter always had been interested in the vast unknown stretches of Asia, and what he had heard of Bolongu, the Land of the Golden Scarab, had been of a nature to make him long to go there.

There was every reason to suppose that William Pike had found his way into this strange country, because Leslie Arnold knew that he himself was on his way there when he managed to escape. Pike had some kind of compact with the natives of Bolongu, and it was to their land he had doubtless gone when his scheme against young Arnold failed.