“The girl who thinks she has found our old motor boat–eh?” asked the burly doctor.

“I am sure she has found it, sir,” declared Polly. “And what are Eb and his chum, Billy Smith, trying to do there at the raft, Wyn?”

“They suspect something; but the boys have got the float right over the sunken boat and have promised to hold the bateau men off—”

Just then Dr. Shelton turned quickly, picked up a megaphone and bawled through it to the bateau men, one of whom had leaped aboard the boys, raft.

“Hey, you! Get off that raft and keep off it, or I’ll put you both in jail at the Forge. Understand me?”

It was evident that the boatmen did understand the doctor, for the trespasser aboard the raft leaped back into the bateau without a blow being struck, although the boys were ready for him. The big sail of the craft was immediately raised and she had borne off to some distance when the Sunshine Boy was allowed to drift in close to the float.

“Now, boys,” said Dr. Shelton, genially, “I understand you have found my old Bright Eyes under water here and have been guarding it from all comers. Is that right?”

“No, Doctor,” returned Dave. “We fellows have had mighty little to do with it. It’s the girls—”

“It’s Wyn!” cried Frank, “and nobody else.”

“Wyn did it all,” agreed Bess.