A Son of Perdition by Fergus Hume

It was August when Alice returned home. As soon as her father learned that she had become engaged to Montrose, he sent for her. Now that the mouse had entered the trap there was no need for the girl to remain in London and spend money. Mrs. Barrast was sorry to lose the companionship of Miss Enistor, not only because she liked her as much as one of her shallow nature could like any one, but for a more selfish reason. With Alice departed Montrose, and although he did not go immediately down to Cornwall, he scarcely came near the house in Hans Crescent. Thus Mrs. Barrast was deprived of the many presents which she loved to receive. However, she had done very well, and made the best of her loss, since the girl's visit, because of Montrose's love-making, had not been unprofitable to her. Mrs. Barrast was very affectionate when Alice departed, and made her promise to return when she became Mrs. Douglas Montrose.

Alice readily consented, for though Amy was vain and selfish, yet the fact that the love-romance had taken place beneath her roof made the girl regard her as a most excellent friend. All the same she was not sorry to return to Cornwall, as she was weary of the frivolous London life.