Rosa was still standing just behind her when Margaret turned back to her desk, and the younger girl gave her one last dagger look, a glitter in her eyes so sinister and vindictive that Margaret felt a shudder run through her whole body, and was glad that just then Rosa's father called to her that they must be starting home. Only one more day now of Rosa, and she would be done with her, perhaps forever. The girl was through the school course and was graduating. It was not likely she would return another year. Her opportunity was over to help her. She had failed. Why, she couldn't tell, but she had strangely failed, and all she asked now was not to have to endure the hard, cold, young presence any longer.

"Sick nerves, Margaret!" she said to herself. "Go home and go to bed. You'll be all right to-morrow!" And she locked the school-house door and walked quietly home with the faithful Bud.

The past month had been a trying time also for Rosa. Young, wild, and motherless, passionate, wilful and impetuous, she was finding life tremendously exciting just now. With no one to restrain her or warn her she was playing with forces that she did not understand.

She had subjugated easily all the boys in school, keeping them exactly where she wanted them for her purpose, and using methods that would have done credit to a woman of the world. But by far the greatest force in her life was her infatuation for Forsythe.

The letters had traveled back and forth many times between them since Forsythe wrote that first love-letter. He found a whimsical pleasure in her deep devotion and naïve readiness to follow as far as he cared to lead her. He realized that, young as she was, she was no innocent, which made the acquaintance all the more interesting. He, meantime, idled away a few months on the Pacific coast, making mild love to a rich California girl and considering whether or not he was ready yet to settle down.

In the mean time his correspondence with Rosa took on such a nature that his volatile, impulsive nature was stirred with a desire to see her again. It was not often that once out of sight he looked back to a victim, but Rosa had shown a daring and a spirit in her letters that sent a challenge to his sated senses. Moreover, the California heiress was going on a journey; besides, an old enemy of his who knew altogether too much of his past had appeared on the scene; and as Gardley had been removed from the Ashland vicinity for a time, Forsythe felt it might be safe to venture back again. There was always that pretty, spirited little teacher if Rosa failed to charm. But why should Rosa not charm? And why should he not yield? Rosa's father was a good sort and had all kinds of property. Rosa was her father's only heir. On the whole, Forsythe decided that the best move he could make next would be to return to Arizona. If things turned out well he might even think of marrying Rosa.

This was somewhat the train of thought that led Forsythe at last to write to Rosa that he was coming, throwing Rosa into a panic of joy and alarm. For Rosa's father had been most explicit about her ever going out with Forsythe again. It had been the most relentless command he had ever laid upon her, spoken in a tone she hardly ever disobeyed. Moreover, Rosa was fearfully jealous of Margaret. If Forsythe should come and begin to hang around the teacher Rosa felt she would go wild, or do something terrible, perhaps even kill somebody. She shut her sharp little white teeth fiercely down into her red under lip and vowed with flashing eyes that he should never see Margaret again if power of hers could prevent it.

The letter from Forsythe had reached her on Saturday evening, and she had come to the Sunday service with the distinct idea of trying to plan how she might get rid of Margaret. It would be hard enough to evade her father's vigilance if he once found out the young man had returned; but to have him begin to go and see Margaret again was a thing she could not and would not stand.

The idea obsessed her to the exclusion of all others, and made her watch her teacher as if by her very concentration of thought upon her some way out of the difficulty might be evolved; as if Margaret herself might give forth a hint of weakness somewhere that would show her how to plan.

To that intent she had come close in the group with the others around the teacher at the close of meeting, and, so standing, had overheard all that the Brownleighs had said. The lightning flash of triumph that she cast at Margaret as she left the school-house was her own signal that she had found a way at last. Her opportunity had come, and just in time. Forsythe was to arrive in Arizona some time on Tuesday, and wanted Rosa to meet him at one of their old trysting-places, out some distance from her father's house. He knew that school would just be over, for she had written him about Commencement, and so he understood that she would be free. But he did not know that the place he had selected to meet her was on one of Margaret's favorite trails where she and Bud often rode in the late afternoons, and that above all things Rosa wished to avoid any danger of meeting her teacher; for she not only feared that Forsythe's attention would be drawn away from her, but also that Margaret might feel it her duty to report to her father about her clandestine meeting.