“Of course,” agreed Bob, as they chugged back to Cliffside in the rain and darkness.

It cannot be said that the young detective was very much discouraged or disappointed at the result of this excursion. It had been but a slim chance, at best, but slim chances must be taken when trying to solve mysteries or catch criminals.

As a matter of fact Bob Dexter would have been rather sorry, in a way, had the foolish man turned out to be Rod Marbury. For the credit of the capture would have gone to Chief Duncan. And Bob wanted to solve the mystery himself.

“And I want to find out the secret of the log cabin,” he told himself as he got into bed late that night, or, rather, early the next morning. “I want to find out how the key got back in the room.”

For about a week there were no more moves in the case—that is, moves which appeared on the surface. What was going on beneath no one could tell.

Pietro Margolis continued to dig holes and plant his “monkey nuts,” as Bob called them. Jolly Bill Hickey continued to reside at the Mansion House, now and then going to Storm Mountain to visit Hiram Beegle. The old sailor was now quite himself again, but he could throw no additional light on the strange robbery.

“I don’t know where the treasure is, nor whether Rod is digging it up or not,” he said. “I’m fogbound—that’s about it—fogbound.”

But Bob Dexter was anything except discouraged. He had youth and health, and these are the two best tonics in the world. Of course he would have been glad to come at a quick solution of the mystery.

“Though if I did there wouldn’t be much credit in solving it,” he told himself more than once. “If it was as easy as all that, Ned or Harry could do as well as I, and I wouldn’t like to think that. A regular detective wouldn’t give up now, and I’m not going to!”

Bob squared his shoulders, clenched his hands and walked about with such a defiant air that his chums, more than once, asked him after that why he was carrying a “chip on his shoulder.”