"But who--what?" gasped Jane.

"I believe he is the man who has been following us and trying to drive us away. I can't think of any other reason for his acting as he has. He undoubtedly knows that we are somewhere about, and has been looking for us just as the boys themselves have been doing."

"Good gracious," muttered Crazy Jane. "I'm sorry I didn't stay on the boat."

"And I am glad you did not. You surely have discovered something. Would you know the man if you were to see him again?"

"Yes."

"Then we will see if we can't discover him again. I believe we are getting near to a solution of the enemy that has been following us.

Either we must settle him or he will do us some injury. I am glad the boys saw him, too. I am going to suggest to Miss Elting that we go back to our old anchorage to-morrow. To-day we have other plans on hand. And that reminds me. It is getting dark and it is time we were getting back to the boat. We will go down the rope when we reach there. Come."

The two girls hurried along, keeping a sharp lookout, not knowing but that the boys might be lying in wait for them. They reached the rocks above the houseboat. All was quiet below. Jane went down the rope first, landing in the creek. Harriet did the same, and none of their companions discovered either of them until Jane had climbed aboard the boat and appeared dripping before them.

"Here we are, girls," laughed Jane.

"Did you discover anything?" asked Miss Elting eagerly.

"We did."

"Tell us what happened," urged the guardian.

"The boys found the false trail we made, as well as the one we did not wish them to find. They nearly discovered Jane, too. She sat in a tree while they made their plans nearby. Then Jane fell out of the tree."

The girls shouted.

"And what do you think?" continued Harriet. "The boys were only a short distance away. They hurried to the scene, and when they got there they found--"

"Jane," finished Tommy.

"No. A man. A half-breed from what Jane says. He went away in a canoe.

He did not see her."

Miss Elting regarded Harriet reflectively.

"Yes, I think it was the same one," said Harriet in answer to the guardian's unspoken question. "It is evident that our presence here is suspected by others than the Tramps. I would suggest that we carry out our plans to-night, then move away from here to-morrow."

CHAPTER XXII

SPOOKS OF THE LONESOME ISLE

"Yes, I know the way. I could go there blindfolded," answered Harriet, in reply to a question from Miss Elting.

The hour was nine o'clock in the evening. The night was very dark, though the stars were shining. It had been decided that Margery and Tommy should remain on board the "Red Rover," putting out all lights and locking the doors, though no anxiety was felt about them, as there was scarcely a chance that their presence would be discovered, provided the girls remained quiet.

The paraphernalia for the evening's enterprise was carefully loaded into the rowboat; then, with final admonitions to Tommy and Margery to keep silent and not be afraid, the party set out in the rowboat for the entrance of the creek. They paused there long enough to make certain that no one was about, after which they rowed along the sh.o.r.e a short distance and made a landing at a point where the ground was fairly level.

"Now be very quiet," whispered Harriet. "Remember the signal to return to the boat is one long caw. Two caws in quick succession mean 'hurry.'"

"We shan't be far apart, shall we?" questioned Hazel, somewhat apprehensively.

"No. Within speaking distance," replied Miss Elting. "Leave it to Harriet and Jane to make the first advance. We will follow when the time is right. It is fortunate that we left Tommy and Margery at home. Are you ready, Harriet?"

It was a silent party of four shadowy figures that made its way cautiously along the sh.o.r.e of the island for some little distance. The party then turned sharply to the right and disappeared among the bushes that marked a slight rise of ground. Reaching this rise they turned to the left and once more proceeded straight ahead.

The lights of a campfire were soon distinguishable between the trees.

The party was nearing the camp of the Tramp Club. The time to prepare for their final triumph was at hand.

"Now, Harriet," urged Miss Elting in a half whisper.

"Yes. I will go around to the other side of the camp. That will be the most difficult position to get away from, so I am choosing it for myself. Jane, you will remain here, while Miss Elting and Hazel will take a position halfway between us. You see that will enable us practically to surround the camp. After you hear me, wait a moment, then give them a thriller."

Harriet, accompanied by the guardian and Hazel, stepped promptly away.

After going on for some distance, the girl directed Miss Elting and Hazel to stop and remain where they were, except that they were to separate, yet keep within easy call of each other. This detail arranged, Harriet went on.

According to previous arrangement, Jane, Miss Elting and Hazel gradually crept nearer to the camp, continuing until they could make out the figures of the boys quite plainly. The latter were sitting about the campfire. Their att.i.tude was one of dejection. They had been outwitted and they knew it.

"If we don't find those girls to-night, then to-morrow morning we'll get out of here," announced George. "They know that they have won and we'll let them come and tell us so rather than hunt all summer for them."

"What about that half-breed?" asked Sam. "I think we'd better find out who he is. I didn't like the looks of that fellow a little bit."

"Neither did I," agreed George. "Queer we never saw him around here before."

"You must remember this is a large lake," Billy informed them. "He probably is a fisherman who hangs out on the island, and who resented our encroaching upon his preserves. I think I saw the same fellow once in a canoe, but he was so far away that I don't think I would know him were we to meet face to face."

"There are too many mysterious things on this island," averred Larry Goheen, with emphasis. "I, for one, shall be glad to get away from it. I know there are spooks here."

"Spooks!" jeered George. "Who's afraid of spooks? Who--" George's voice trailed off almost into a whisper. "I heard something," he exclaimed.

"So did I," added Larry, nodding.

A laugh, a distinctly human laugh, shrill and mocking, was wafted to them. The boys gazed questioningly at each other. Larry glanced about apprehensively. Then out of the night came the most weird, most demoniacal laugh any member of the Tramp Club ever had heard.

The boys sprang to their feet.

Other laughs, accompanied by shrieks, followed each other in quick succession. The laughs seemed to come from all quarters. It was difficult to say from just what particular point any one of them did come.

"Spooks!" yelled Larry Goheen, bolting toward the lake. Billy caught and jerked him back.

"No, you don't," growled Billy. "We stand together."

"I don't want to stay here," chattered Larry. "I never try to fool people with fake courage when I know that running is my one best course to pursue."

"Is there a lunatic asylum in this part of the country?" asked Baker.