"Yes," agreed Elfreda. "Such an evening as this makes one forget the awful heat, and lays hold of one's spirit. Then the silence— no whistling of wind, no rustling of leaves. Why, I find myself holding my breath so as not to break the silence."

"I had not observed it," retorted Grace, presenting a smiling face to her companion. "The camp should be ready by now. I move we go back and turn in."

"The mystery of it all, too," added Elfreda, turning to walk to the camp.

The guide told them not to be concerned at his absence if he did not get in until late on the following day, and the Overland Riders sought their blankets for a rest which all needed.

The night passed without one of the girls moving, so far as any of them could remember, when they were rudely awakened next morning.

Shouts and yells from Hippy Wingate, and a scream from Emma Dean, brought Grace, Elfreda, Anne and Nora to their feet, hurriedly throwing on sufficient clothing to make themselves presentable.

"Girls! Hurry, hurry!" shrieked Emma.

"Coming! Hold fast!" shouted Elfreda Briggs, running out ahead of the others.

CHAPTER XIV

THE MYSTERIOUS HORSEMAN