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.