"This is a bigger mystery than I can see through," said Ned as he bent over the blackened stones of the fireplace. "The boys must have left here some time yesterday, for these ashes are cold. It looks as though they had to leave in a hurry, too, for if they had any time to spare they would surely have placed a message where we could see it. I have examined all the trees and bushes, and there is no sign of any."