Frank, in his flight across the plateau, suddenly heard a thrilling sound.
He turned his head and clear to his hearing came the shrill whistle of the Steam Horse.
“Barney and Pomp!” he gasped. “What has brought them here?”
Sure enough, across the plateau, at whirlwind speed, came the Steam Horse.
But directly behind the horse was a body of United States troops, with Captain Elmo at their head.
They came down at a swinging gallop upon the counterfeiter’s den.
Bert Mason with dismay had seen the whole affair. The villains gave a yell of terror and running to the edge of the plateau disappeared.
In a twinkling every one of the counterfeiters had disappeared in the same manner.
The trapper Beaver Bill was left standing alone in the middle of the plateau not in the least harmed.
“Wall, by thunder!” he cried. “What skeered them off that way?”