“Yes. They don’t grow on trees. They’re to be found in the cottages around here. We caught some fine specimens.”

David put his hand on Ben’s knee. “It was time we rescued you from that fellow, my boy,” he said. “I don’t know anything about hooked-rugs, but I think your Mr. Fitzhugh has bats in his belfry.”

The car driven by Mr. Perkins had stopped, and Ben brought his own noisy equipage to a standstill at the side of the road. “We’re going to have another look at the cove,” said Tuckerman. “We can’t drive in through the woods.”

But the cove, when they reached it by the path through the woods, was as deserted as it had been when the boys from Camp Amoussock explored it earlier in the evening. Lanky and Tom pointed out the dory, still beached on the shingle, in which the three men had come ashore, and the shack in which they had kept the costumes. “I think the dory is pretty good proof that they didn’t come back here,” said Tom. “I guess they must have made off toward Gosport, to join the fishing-smack somewhere in that neighborhood.”

They returned to the two cars and drove on to Camp Amoussock. There Tom and John Tuckerman embarked in the Argo to sail back to Cotterell’s Island, while Ben and David continued their clattering ride to Barmouth.

At Barmouth, Ben restored the car to his uncle, and the two boys went down to the harbor and launched the canoe. Over the placid water they paddled easily, for they were old hands at handling a canoe together. And presently they landed at the island, and found the other two sitting on the pier.

There was much to talk over, and none of them were sleepy. They sat on the bank above the beach and swapped adventures. “I’ve been wondering,” said Tom, “whether there was any connection between the men who stole those things at Mr. Fitzhugh’s house and the men I saw here on the island last night.”

“And the gigantic footprints,” said David. “I’ve been thinking about that, too. But how would you explain the lady’s handkerchief, with the initials A. S. L.?”

They argued about that for some time before they went to bed. Ben, however, took little part in the discussion. He was trying to find a reason for the discovery of the silver snuff-box that Joseph Hastings had bought in Barmouth in the chest hidden in the cliff.

Next morning Ben went with Tuckerman to Cotterell Hall. “What do you make of it, Ben?” said Tuckerman. “We don’t seem to be any nearer to finding the treasure than we were when we first came here. I know you’ve got some theory in that wise head of yours.”