Neither of the girls commented upon the conversation they had overheard. For a long while they sat on their horses, gazing in awe at the tumbling water.

“If ever that dam should let go—” Penny shuddered, “why, the valley would be flooded in just a few minutes. I doubt folks could be warned in time.”

“It looks as if it could give way any second too,” Louise added uneasily. “Why don’t we get out of this valley and stay away?”

“And forget the mystery?”

“A lot of good a mystery would do us if that dam lets go! Penny, we were crazy to come here in the first place!”

“But I want to get a big story for Dad’s paper. There’s one here.”

“I know not what course others may take,” Louise quoted grandly. “As for myself, I’m going home on tomorrow’s train—rain or shine.”

“We’ll both have to go,” Penny agreed in a discouraged tone. “I had my chance here, but somehow I’ve muffed it.”

For a half hour longer the girls remained at the dam watching the workmen. Presently returning to the Lear cottage they found Mrs. Lear in the warm kitchen, cooking supper.

“I’m settin’ the victuals on early tonight,” she announced. “We ain’t got any too much time to git to the frolic at Silas’ place.”