"Panther! What panther?" demanded Jerry, starting up in his seat.

The lithe, black beast appeared just then over the brow of the hill. The men who had started after the beast were below in the ravine, yelling, and driving the creature toward them. The motor car was the nearest object to attract the great cat's wrath, and there is no wild beast more savage and treacherous.

Tom was having trouble in starting the car. Besides, it was headed directly for the huge cat, and the latter undoubtedly had fastened its cruel gaze upon the big car and its frightened occupants.

Ruth Fielding and her friends had been in serious difficulties before. They had even (in the woods of the Northern Adirondacks and in the foothills of the Montana Rockies) met peril in a somewhat similar form. But here, with the panther creeping toward them, foot by foot, the young friends had no weapon of defense.

Ruth had often proved herself both a courageous and a sensible girl. Coming from her old home where her parents had died, a year and a half before, she had received shelter at the Red Mill, belonging to her great uncle, Jabez Potter, at first as an object of charity, for Uncle Jabez was a miserly and ill-tempered old fellow. The adventures of the first book of this series, entitled "Ruth Fielding of the Red Mill; Or, Jasper Parloe's Secret," narrate how Ruth won her way—in a measure, at least—to her uncle's heart.

Ruth made friends quickly with Helen and Tom Cameron, and when, the year previous, Helen had gone to Briarwood Hall to school, Ruth had gone with her, and the fun, friendships, rivalries, and adventures of their first term at boarding school are related in "Ruth Fielding at Briarwood Hall; Or, Solving the Campus Mystery."

In "Ruth Fielding at Snow Camp; Or, Lost in the Backwoods," the third volume of the series, are told the mid-winter sports of our heroine and her friends; and later, after the school year is concluded, we find them all at the seaside home of one of the Briarwood girls, and follow them through the excitement and incidents of "Ruth Fielding at Lighthouse Point; Or, Nita, the Girl Castaway."

When our present story opens Ruth and the Camerons have just returned from the West, where they had spent a part of the summer vacation with Jane Ann Hicks, and their many adventures are fully related in the fifth volume of the series, entitled "Ruth Fielding at Silver Ranch; Or, Schoolgirls Among the Cowboys."

Few perils they had faced, however, equalled this present incident. The black panther, its gleaming eyes fixed upon the stalled motor car and the young folk in it, crouched for only a moment, with lashing tail and bared fangs.

Uttering another half-stifled snarl, the beast bounded into the air. The distance was too great for the brute to pass immediately to the car; but it was plain that one more leap would bring her aboard.