"Hurrah!" cried Frank, seeing the enemy was repulsed. "I fancy they have had about enough of us."

He hastened to replenish the magazine of his rifle.

Bart's first thought, on seeing the fight was over, was of the girl they had been defending. He turned and found her safe where she had been placed behind the large bowlder, but she was still holding her hands over her ears, and her face was very pale.

Frank sprang outside the rocks, caught up the other girl, and leaped back quickly, placing her gently on the ground.

"I hope she is not harmed," he said, as he deftly removed the mask.

The moment the girl's face was exposed a shout of amazement broke from the lips of both lads. They stared first at one girl and then at the other, looking bewildered.

The girls were almost counterparts of each other!

"They are doubles!" exclaimed Frank. "Taken separately, it would be impossible to tell one from the other."

Then he turned on the girl they had been defending, stared straight into her face for a moment, and asked:

"What is your name?"