She went on out of the house, and down the street. It was Vidal’s hand; not a doubt of that. Not a doubt either that it was intended for her sister. The scrawled direction indicated that the note had been written in haste; it would be very like the Marquis to forget the existence of an elder sister, thought Mary with a wry smile.

She was a little absent-minded over the marketing, and came back with slow steps to the house. She ought to give the billet to Sophia, of course. Even as she admitted that, she realized that she would not give it to her, had never meant to from the moment it had been put into her hand. There had been an air of suppressed excitement about Sophia all the morning; she was full of mystery and importance, and had twice hinted at wonders in store for her, but when questioned she had only laughed, and said that it was a secret. Mary was anxious as she had not been before; this letter — and after all it was certainly directed to herself — might throw a little light on Sophia’s secret.

It threw a great deal of light. Safe upstairs in her bedroom, Mary broke open the seal, and spread out the single thick sheet of paper.

“ Love — ”the Marquis began — “ It is for to-night. My coach will be at the bottom of your street at eleven. Join me there and bring nothing that you cannot hide beneath your cloak. Vidal. ”

Miss Challoner’s hand crept to her cheek in a little frightened gesture she had had from a child. She sat staring at the brief note till the words seemed to start at her from the page. Just that curt command to decide Sophia’s future! Lord, but he must be sure of her! No word of love, though he called her by that sweet name; no word of coaxing; no entreaty to her not to fail him. Did he know then that she would go with him? Was this what they had arranged in that stolen interview last night?

Miss Challoner started up, crumpling the letter in her clenched hand. Something must be done and done quickly. She could burn the message, but if Sophia failed Vidal tonight, would there not be another to-morrow? She had no notion where Vidal meant to take her sister. A coach: that meant some distance. Doubtless he had a discreet house in the country. Or did he intend to cheat Sophia with a pretended flight to Gretna Green?

She sat down again, mechanically smoothing out the letter. It was of no use to show it to her mother; she knew from Sophia what absurd dreams Mrs. Challoner cherished, knew enough of that lady, too, to believe her capable of the crowning folly of winking at an elopement. Her uncle could do nothing, as far as she could see, and she had no wish to blazon Sophia’s loose behaviour abroad. When the idea first came to her she did not know; she thought it must have been hidden away in her brain for a long while, slowly maturing. Again her hand stole to her cheek. It was so daring it frightened her. I can’t! she thought. I can’t!

The idea persisted. What could he do after all? What had she to fear from him? He was hot-tempered, but she could not suppose that he would actually harm her, however violent his rage.

She would need to act a part, a loathsome part, but if she could do it it would end the Marquis’s passion for Sophia as nothing else could. She found that she was trembling. He will think me as light as Sophia! she reflected dismally, and at once scolded herself. It did not matter what he thought of her. And Sophia? What would she say? Into what transports of fury would she not fall? Well, that did not signify either. It would be better to bear Sophia’s hatred than to see her ruined.

She consulted the letter. Eleven o’clock was the hour appointed. She remembered that she was to spend the evening with her mother and sister at Henry Simpkins’ house, and began to lay her plans.