Presently Jack saw Nick come breathlessly back. He did not say a word to any one, but, putting off in one of the dinkies, went aboard the Wireless. Two minutes later he appeared again, and Jack saw to his surprise that he was trying to hide a piece of stout rope under his coat.

Of course, his curiosity was aroused, but he did not say anything either to Nick or the others. The fat boy, casting a suspicious glance around, and with a wide grin on his face when he looked at Jimmy in particular, again sauntered off. Jack noticed that when he thought he had passed beyond their range of vision, Nick actually started on a run. No wonder he had seemed breathless when he came in, if that was what he had been doing.

“What can the sly fellow be up to?” Jack said to himself. “I believe I’d better keep an eye open, for he’s always so ready to tumble into trouble.”

So as he worked alongside Jimmy, he kept his eyes and ears on the alert. Perhaps fifteen minutes passed. Then those in camp heard a husky call that caused them to look up the shore.

It chanced that there was a clump of mangroves at the nearby point, and around this Nick hove in sight. He seemed to have harnessed himself in some fashion with the rope, and was tugging with might and main.

“Now, what under the sun can he be doing?” ejaculated the surprised Herb.

“He’s got something along, and seems to be dragging it through the shallow water!” Josh declared.

“And look at it splash, would you?” Herb went on. “Say, d’ye suppose, now, Nick’s gone and caught a turtle, one of those big loggerheads they were telling us about?”

“Turtle nothing!” laughed Jack; “that’s a fish!”

“A fish!” cried Jimmy, turning pale; “do ye mane to till me he’s gone and caught a whale?”