“I don’t know. But we’ll find out. Father has an idea, and if it’s so—”

“Oh, what?” cried ’Phemie.

“You just wait!” returned Harris, hurrying away.

“Mean thing!” ’Phemie called after him. “You oughtn’t to have any dinner.”

But there was little chance for Harris to talk with the girls that day. Before the dinner dishes were cleared away, a thunder cloud suddenly topped the ridge, and soon a furious shower fell, with the thunder reverberating from hill to hill, and the lightning flashing dazzlingly.

Behind this shower came a wind-storm that threatened, for a couple of hours, to do much damage. Everybody was kept indoors, and as the night fell dark and threatening the Castles had to be put up until morning.

The wind quieted down at last; so did the nervous members of the party inside Hillcrest. When Lyddy and ’Phemie thought almost everybody else was abed but themselves, and they were about to lock up the house and retire, a candle appeared in the long corridor, and behind the candle was Harris Colesworth, fully dressed.

“Sunday is about over, girls,” he said, “and I can’t possibly sleep. I must do something. Didn’t you tell me, Miss ’Phemie, there were retorts and test-tubes, and the like, in your grandfather’s rooms?”

“In the east wing?” cried Lyddy.

“Yes.”