"Come, what's the matter with you?" he asked. "You never used to be afraid of the dark; you were as bold as brass. What have you done? Murdered somebody?"

"No," answered Elsie, laughing. "I'm only—only a bit silly."

She looked up with a smile as she spoke. No one ever doubted Brian's pluck, and the fact that he did not think her a coward encouraged Elsie to be brave. Brian knew that something really had frightened the child on the previous Thursday evening, but he had not mentioned the matter to any one except Mrs. Ormond, for which Elsie was in her heart devoutly thankful to him, as she knew what a "roasting" she would receive from Ida and Guy if once they got hold of the story.

But though Brian forbore to tell what he knew, or even to question her further, yet the incident had been constantly in his mind. He wondered greatly what could have been the cause of his cousin's alarm, and why she should refuse to explain this when hitherto he had always been in her confidence. On Friday, without saying anything to anybody, Brian made a careful examination of the tool-house, hoping to find some clue to the mystery; but his search proved fruitless.

There was nothing in the place calculated to alarm the most timorous of mortals; and as the boy glanced round he saw simply just what he had seen there many times before—the grindstone, Uncle Roger's box, some gardening tools, and sticks for rose-trees and other plants, a quantity of matting stuff which had been wrapped round some plants and shrubs when they came from a nursery, some old hampers, and a short wooden bench on which the new boy, Henry, cleaned the knives and boots. There was certainly nothing here to cause any one to drop a lamp and run screaming into the house.

Still, Brian was not satisfied. He was perhaps rather pleased to think that there was some mystery connected with the tool-house; it was like trying to solve a very interesting puzzle.

"If only I had a clever detective here, like Sherlock Holmes!" he said to himself. "I suppose he'd just look round and find some clue which would explain the whole matter. I must confess I can't see anything. Now that's what began it all," he continued, as his eye rested on the grindstone. "I believe Elsie really did hear some one turning that stone, and it's my opinion that he, or she, whoever it might have been, was grinding the carving-knife; but there the story stops short, and doesn't seem to go any further. Besides, that doesn't explain what frightened Elsie the other evening. I wish she'd tell me, but I'm afraid she won't."

Brian went over and began carelessly working the grindstone with his left foot on the treadle. "I know what I'll do," he thought. "Each night I'll come out and tie the crank of this thing to the stand with a piece of thin black cotton; then I shall soon find out if any one comes and works here at night, for if they do, the thread will be broken in the morning."

Without saying anything to the others, he slipped out on Friday evening and set his trap; but when he went to examine it on the following morning the cotton was still unbroken, though it snapped at once the moment he pressed down the treadle. Nothing daunted by his failure, Brian made up his mind to try the same thing several nights running, and with this determination had hurried away to join his cousins as they started for school.

"Where's father?" inquired Ida, as the family assembled at the dinner-table.