The traveling jeweler whirled upon the officer.

“How is this, Captain?” he demanded, anxiously.

“We were just wondering how the fire started,” the other explained, “and I declared it could not have come from any carelessness of my crew, and that there was no chance of an accident. In a word, sir, I vowed the fire must be of incendiary origin. Frank, here, and his friends were asking what reason any one would have for setting this boat on fire, when you rushed up stating your loss.”

“I begin to grasp your meaning. It implies that in order to cover up their robbery the thieves started this fire, thinking that if the boat burned no one might be the wiser. That looks very plausible. Did I understand this boy to say you had an idea concerning the identity of the criminal?” Mr. Pemberton asked eagerly.

“Yes, I believe I have,” said Captain Amos, sturdily.

“Then I demand that you place him under arrest immediately, before he can escape with my property. Is there more than one concerned, do you think? Ah! I have an idea I know whom you mean—the two tramps who came aboard at Newtonport?”

“Exactly. They are the ones I suspect. It would be easy to start such a blaze undetected, for no one would be dreaming of such rascality,” replied the officer.

“And taking advantage of the sudden confusion,” went on the passenger, “when men and women were shouting, and rushing frantically about, they must have searched my luggage purposely, knowing that I was carrying a valuable packet in my bag.”

“That would appear to cover the case, sir. In the light of this explanation do you still insist upon every one being searched?” demanded Captain Amos.

Mr. Pemberton also looked toward Frank, although, perhaps, unconsciously. The latter smiled and hastened to remark: