"Ha-ha! ha-ha-ha!" repeated the mocker.

"I wonder if he sees me, and is laughing at me now?" thought the girl.

She gave a little shiver. It was not a very pleasant sensation to feel herself spied upon by an unseen watcher, and she began to beat a hasty retreat towards her own window again.

"Ha-ha!" laughed the unseen one, with such a note of triumph that now she was certain the humour was at her expense. It annoyed her, and at the same time it rather frightened her. Was it possibly a madman?—for assuredly the chuckles became madder and madder as they increased. Besides which, what sane person would be out of bed and giggling at such an hour? The thought of a lunatic or two at large lurking round the house was discomforting indeed. In England, with fast-barred doors and windows that are supposed to be unassailable, it would not be pleasant; but here—where what might be called the "front door" was nothing but the flimsiest of French windows, the windows themselves utterly powerless to keep any one out—the English girl found this new suspicion particularly disagreeable. She wondered whether she ought not to go and rouse Mr. Orban. Perhaps he ought to be warned, she reflected, so as to be ready in case these maniacs burst into the house, intent on the mischief they were so evidently gloating over in anticipation.

"I wish I knew what to do," she thought in great agitation.

"Ha-ha! ha-ha-ha-ha!" responded the laughers with maniacal glee.

"Why, Aunt Dorothy," exclaimed Nesta, as Miss Chase entered the room in a hurry, "what have you been doing?"

Nesta was sitting up in bed. She had evidently awakened, and discovering her aunt's absence, was wondering about it. It comforted Miss Chase to have some one to speak to; but, determined not to frighten the child, she said as steadily as she could,—

"I was only trying to find out what those people are laughing at out there. It seems such a strange time to be so amused. I suppose they must be some of the coolies going to work."

"People!" repeated Nesta blankly.