“And why not by me?” demanded the other, goaded by the Indian’s tone and by the slight emphasis which the red man placed on his name.

“Because,” said Natachee coolly, “you are not the killing kind, and because if you should, in a moment of wild madness, attempt such a thing, I—“ he paused, then with an abrupt change in his tone and manner said: “I am sorry that I startled you. It was unpardonably rude, I’ll admit, and you have every reason for being angry. I did not stop to think.”

“It is nothing,” returned Edwards. “I was a fool to fly up over such a thing. I—I’m a bit upset just now, that’s all. Forget it.”

He resumed his seat on the rock. The Indian seated himself on the ground near-by.

Edwards was thinking: Marta had said that Natachee had come to the house while the officers were there. How much of the sheriff’s talk had the Indian heard? How much had he guessed? What was he doing here?

Almost as if to answer the white man’s thoughts the Indian said casually:

“I happened in at the Pardners’ place a while ago and found Sheriff Burks and two deputies there. I am going to Tucson to-morrow and dropped in to see if I could do any errand for them or for Miss Hillgrove. Then I called at your place to offer a like service but you were not at home. I happened to see you sitting on the rock here as I came up the cañon.”

The Indian did not explain how, before the officers were out of sight, he had made his way with the noiseless speed of a fox to a point where from behind rocks and bushes he had witnessed the close of the interview between Marta and Edwards; and how, after the girl had returned to her home, he had trailed the white man. Neither did he explain that he had had no thought of going to Tucson when, from the mountain side, he saw Sheriff Burks and his men ride up to the Pardners’ place.

“Thank you,” said Edwards, “there is nothing you can do for me in Tucson.”

Natachee waited several moments before he spoke again, and the uncomfortable thought flashed into Edwards’ mind that the Indian seemed particularly pleased that he, the white man, had nothing to say. Edwards, in an agony of suspense, wondering, fearing, perplexed, baffled, dared not speak.