John Brownleigh reached the water-hole at sunset, and while he waited for his horse to drink he meditated on what he would do next. If he intended to go to the fort for dinner he should turn at once sharply to the right and ride hard, unless he was willing to be late. The lady at the fort liked to have her guests on hand promptly, he knew.

The sun was down. It had left long splashes of crimson and gold in the west, and their reflection was shimmering over the muddy water below him so that Billy looked as if he quaffed the richest wine from a golden cup, as he satisfied his thirst contentedly.

But as the missionary watched the painted water and tried to decide his course, suddenly his eye caught a bit of white something floating, half clinging to a twig at the edge of the water, a bit of thin transparentness, with delicate lacy edge. It startled him in that desert place much as the jewel in its golden setting in the sand had startled him that morning.

With an exclamation of surprise he stooped over, picked up the little wet handkerchief and held it out--dainty, white and fine, and in spite of its wet condition sending forth its violet breath to the senses of a man who had been in the wilds of the desert for three years. It spoke of refinement and culture and a world he had left behind him in the East.

There was a tiny letter embroidered in the corner, but already the light was growing too dim to read it, and though he held it up and looked through it and felt the embroidery with his finger-tip he could not be sure that it was either of the letters that had been engraved on the whip.

Nevertheless, the little white messenger determined his course. He searched the edge of the water-hole for hoof prints as well as the dying light would reveal, then mounted Billy with decision at once and took up his quest where he had almost abandoned it. He was convinced that a lady was out alone in the desert somewhere.

It was long past midnight when Billy and the missionary came upon the pony, high on the mesa, grazing. The animal had evidently felt the need for food and rest before proceeding further, and was perhaps a little uneasy about that huddled form in the darkness he had left.

Billy and the pony were soon hobbled and left to feed together while the missionary, all thought of his own need of rest forgotten, began a systematic search for the missing rider. He first carefully examined the pony and saddle. The saddle somehow reminded him of Shag Bunce, but the pony was a stranger to him; neither could he make out the letter of the brand in the pale moonlight. However, it might be a new animal, just purchased and not yet branded--or there might be a thousand explanations. The thought of Shag Bunce reminded him of the handsome private car he had seen upon the track that morning. But even if a party had gone out to ride how would one of them get separated? Surely no lady would venture over the desert alone, not a stranger at any rate.