“A diamond ring,” said the chief. “It is one of several stolen, together with the money, from the Northville store. There’s no doubt now but that the motor boat thieves and those who robbed the store are the same. My! But I wish I could have caught them!”

He placed the ring in his pocket, and, after a look over the boys’ craft, prepared to return to his own.

“Maybe the thieves left some cash behind as well as a ring,” suggested Jerry.

“No such luck,” the chief made answer as he went over the side. “Well, are you boys going down the river?”

“I think we’ll put up at the hotel in Northville, if there is one,” said Jerry. “It’s too long a trip to go back to Cresville to-night.”

“That’s a good idea,” said the chief. “I think I’ll do the same. Just come along with me and I’ll see that you are accommodated with lodgings. I’ll swear you in as my deputies,” he said with a laugh, “and it won’t cost you anything. Besides I may need your help.”

Just as the two boats were making ready for the trip down the river there was a movement on shore. The bushes parted and a roughly dressed man, with what seemed to be a week’s growth of beard on his face, stepped out.

“Can any of you gentlemen oblige a poor tired wayfarer with a lift down this placid stream?” he asked with a bow which took in both parties.

At the sound of his voice the boys started. They wondered where they had heard those tones before.