I murmured to myself, "After the mystery of Great Eyrie, comes that of Milwaukee and Boston.

Will this new problem be as difficult to solve as was the other ?" I noted idly that this new affair had a general resemblance to the other, since both menaced the security of the general public.

To be sure, only the inhabitants of the Blueridge region had been in danger from an eruption or possible earthquake at Great Eyrie.

While now, on every road of the United States, or along every league of its coasts and harbors, every inhabitant was in danger from this vehicle or this boat, with its sudden appearance and insane speed.
I found that, as was to be expected, the newspapers not only suggested, but enlarged upon the dangers of the case.

Timid people everywhere were much alarmed.