It was nearly nine o'clock before Mr Lake went out for his walk, and by that time it was almost dark, and the lamp outside was lighted, which was not far from the door. Lucilla had taken a seat near the window, with the view of witnessing everything; and it cannot be denied that she felt a little excited when Barbara went out of the room after her father, leaving Rose alone with her guest. Miss Marjoribanks's heart gave a beat or two the more in the first minute, though before the next had passed it had fallen into its usual measure. There were no candles as yet in the parlour, and Grove Street—or at least the bit of it which lay before the window, lighted by the lamp outside, and relieved against a little square of bluish-green sky which intervened between Miss Hemmings's house and that of old Mr Wrangle on the opposite side—was very clear to the interested spectator. There was nobody visible but an organ-man, who was grinding a popular melody very dolorously out of his box, in what Rose would have called the middle distance; and beyond, Miss Jane Hemmings looking out of the long staircase window, and three little boys in different attitudes below,—that is, if one did not count a tall figure which, perhaps with the view of listening to the music of the organ, was coming and going in a limited circuit round the light of the lamp.

"How convenient it is to have the lamp so near," said Lucilla. "Oh, don't light any candles, please; it is so nice to sit in the dark. Where is Barbara, I wonder? Let us have some music, and put down that dreadful organ. I hope she has not gone out. And where are you, you sulky little Rose?"

"She has gone upstairs," said Rose, who began to feel all the enormity of her conduct in thus betraying her sister. "I hate sitting in the dark. I hate being a spy; come in from the window, Lucilla, now you are here——"

"My dear Rose," said Miss Marjoribanks, "I think you forget a little. For my part I do not understand what being a spy means. Barbara knows very well I am here. I should scorn to take an advantage of anybody, for my part. If she does not bring him past the very window, and under my eyes—Ah, yes, that is just what I thought," said Lucilla, with gentle satisfaction. But by this time poor little Rose had roused herself into an innocent fury.

"What is just as you thought?" said Rose, laying an impatient grasp on Miss Marjoribanks's arm. "Come in from the window, Lucilla, this moment—this moment! Oh, me, to think it should be my doing! Oh, Lucilla, don't be so mean and shabby and wretched. I tell you to come in—come in directly! If you do not shut the window, and come and sit here in the corner, I will never, never speak to you again!"

Miss Marjoribanks, as was natural, took no notice of this childish fury. She was sitting just where she had been sitting all the evening, within sight of the street lamp and the organ-grinder, and Miss Jane Hemmings at the staircase window;—just where Barbara had placed her, and where that young woman calculated on finding her, when she made a promenade of triumph up the partially lighted street by the side of her clandestine suitor. Perhaps Barbara had seen Miss Jane as well, and knew that public opinion was thus watching over her; but at all events she was not at all ashamed of herself, or indignant at being spied upon. On the contrary, it was a kind of apotheosis for Barbara, only second to the grand and crowning triumph which would be accomplished in Carlingford Church under the shadow of that veil of real Brussels, which grew more and more real every day. Thus neither the actors in the drama, nor the principal spectator, were in the smallest degree disturbed by horror or shame or sense of guilt, excepting always the fanciful little Rose, who suffered for everybody; who could have wished that the earth would open and swallow up Barbara and her lover; who could have slaughtered Lucilla on the spot, and given herself over to any kind of torture for her treachery. Naturally nobody paid any sort of attention to Rose. Barbara, for her part, took her admirer's arm in the twilight with a swelling of exultation, which the gaining of the very highest prize in the department of ornamental art could scarcely have conveyed to the bosom of the little artist; and Lucilla put back her small assailant softly with her hand, and smoothed down her ruffled plumes.

"My dear, it is Miss Hemmings that is spying," said Lucilla; "and poor Barbara would be so disappointed if I were to go away from the window. Have patience just a little longer—there's a dear. It is all exactly as I thought."

And then there followed a pause, which was a terrible pause for Rose. The organ-grinder stopped his doleful ditty, and there was scarcely any sound to be heard in the street except the footsteps approaching and retiring, the measured tread of two people occupied with each other, going now more slowly, now more quickly, as the humour seized them, or as their conversation grew in interest; even the sound of their voices came by times to the auditors—Barbara's with an occasional laugh or tone of triumph, and the other deeper, with which Rose had but little acquaintance, but which was perfectly known to Lucilla. All this time, while her companion sat panting in the dark corner, Miss Marjoribanks was looking to the joints of her harness, and feeling the edge of her weapons. For, after all, it was no small enterprise upon which she was going forth. She was going to denounce the faithless knight to his face, and take him out of the hands of the enchantress; but then she herself meant to take him in hand, and show him his true dangers, and vindicate his honour. A more disinterested enterprise was never undertaken by any knight-errant. Yet, at the same time, Lucilla could not help entertaining a certain involuntary contempt for the man who had deserted her own standard to put himself under that of Barbara Lake, and who was being paraded up and down here without knowing it, to gratify the vanity of his new sovereign, and make an exhibition of his weakness. Lucilla would have been more than mortal if she had not felt the difference between her own rule, which would have been all to his good, and the purely egotistical sway of Barbara; and even in her magnanimous mind, it was impossible that pity itself should not be mingled with a certain disdain.

She sat quite still for so long that Barbara grew intoxicated with her triumph. "It is perhaps the last time," Lucilla said to herself, with a movement of compassion; and the breadth of her human sympathy was such that she waited till the very latest moment, and let the deluded young woman have the full enjoyment of her imaginary victory. Then Miss Marjoribanks rose with a certain solemnity, and put on her hat, and gave an unappreciated kiss to Rose, who kept in her corner. "Good-night; I am going," said Lucilla. The words were simple enough, but yet they rang in Rose's ears like the signal of a conspiracy. When the calm leader of the expedition went forth, sensible of the importance of her mission, but tranquil as great minds always are in a moment of danger, Rose got up too and followed, trembling in every limb. She was capable of having thrown herself upon the spears in her own person in a sudden élan of indignation and passion; but she was not capable of waiting till the right moment, and meeting her antagonists in reasonable combat. Miss Marjoribanks went out deliberately, without any unnecessary haste, sweeping into the dusky twilight with her virginal white draperies. It was a very ordinary scene, and yet, even in the midst of her excitement, Rose could not help observing involuntarily its pictorial qualities—if only any painter could have transferred to his canvas the subdued musical hum of surrounding life, the fragrance of the mignonette, and the peaceful stillness of the summer night. The sky shone out green-blue, lambent and wistful, from the vacant space between Miss Hemmings's and Mr Wrangle's, and there were the dusky twilight shadows below, and the yellow gleam of the lamp, and Barbara's exulting, triumphant figure, and the white robes of the avenging angel. Rose could not have observed all this if she had not been stilled into a kind of breathless awe by the solemn character of the situation, which struck her as being somehow like one of Millais's pictures. As for the lovers, they had just turned at the moment that Miss Marjoribanks came out, and consequently met her straight in the face, as she stood suave and smiling at the little garden door.

"It is Mr Cavendish," said Lucilla; "I am so glad; I have been hoping and trying to see you for ever so long; and as soon as ever I heard you talking I felt sure it was your voice."