John Wilkes was by this time standing beside them, having started up at the first flash of lightning.

"Do you go up, John, into their room," the Captain said. "I think there can be no doubt that these fellows on the roof are Ashford and Frost, but it is as well to be able to swear to it."

The foreman returned in a minute or two.

"The room is empty, Captain; the window is open, and there is a rope hanging down from it. Shall I cast it adrift?"

"Certainly not, John. We do not mean to take them tonight, and they must be allowed to go back to their beds without a suspicion that they have been watched. I hope and trust that it is not so bad as it looks, and that the boys have only broken out from devilry. You know, boys will do things of that sort just because it is forbidden."

"There must be more than that," John Wilkes said. "If it had been just after they went to their rooms, it might be that they went to some tavern or other low resort, but the town is all asleep now."

They again went close to the window, pushed the casement a little more open, and stood listening there. In two or three minutes there was a very slight sound heard.