内容简介：
The sound of the drumming wheels It had roared in the ears of Ruth Fielding for hours as she sat on the comfortably upholstered seat in the last car of the afternoon Limited, the train whirling her from the West to the East, through the fertile valleys of Upper New York State. This had been a very long journey for the girl, but Ruth knew that it would soon come to an end. Cheslow was not many miles ahead now; she had searched it out upon the railroad timetable, and upon the map printed on the back of the sheet; and as the stations flew by, she had spelled their names out with her quick eyes, until dusk had fallen and she could no longer see more than the signal lamps and switch targets as the train whirled her on.