Never again must you go off on the river without a manly protector along."
Frank looked at Paul as he spoke, and winked violently. But Paul was not at all abashed, for he thrust out his chest immediately and said:
"Behold the said manly protector, able, and a willing worker. But didn't you see any boys in a boat while you were here? There were so many afloat this morning it would be strange if none were on the river this afternoon. Think hard, now, girls, and tell us," he said.
"Why, yes," answered Minnie, promptly, "just as we came out here and found the boat gone, we heard the popping of a motor-boat passing down. It went out of sight before we could think to call out, because you see at first we were dazed, and thought we must have landed further down along the side of the island."
"A motor-boat, eh?" cried Frank. "Then it's very evident to my mind that the fellows in that must have amused themselves carrying your boat off and sinking it. And it wouldn't surprise me much if you told me the said boat was the property of"
"Lef Seller!" put in Paul, promptly.
Minnie noded her head violently.
"That's just who it was. I recognized him holding the wheel. Besides, I know the Red Fox well,
