Inside the breakwater the sea was almost as smooth as a mirror. The water was wonderfully transparent, and they could see hundreds of tropical fish swimming lazily at a great depth. On the beach the waves lapped in musical ripples, in striking contrast to the thundering surf on the reef.

The captain wiped his perspiring forehead and drew a long breath of relief. "So far so good," he remarked. "It won't be long now before we'll know whether we've come on a fool's errand or not."

"There's one thing about which the map hasn't lied, anyway," said Drew.

"It pointed out the inlet just where we found it. That's a good omen, it seems to me."

"Let's hope the rest of the map is all right," replied the captain.

"But it's nearly time for dinner now, and we'll have that before going ash.o.r.e."

All were so feverishly impatient, now that they were almost in sight of their goal, that none of them paid much attention to the meal, and it was soon over.

"Do you s'pose the crew have any idee why we're stopping at this island?" asked Tyke. There was a grim look on his seamed countenance, and both the captain and Drew looked at him curiously.

"What's milling in your brain, Tyke?" asked Captain Hamilton. "I've kept my eyes peeled, and I swear I haven't seen anything more to suggest treachery. Ditty's on his best behavior----"

"Yes; that's so," agreed Tyke. "But did you spy the men he took with him in the boat jest now, when he came in here to make soundings?"

"I didn't notice," the captain confessed.

"The orneriest ones of the whole bunch. An', believe me! this is the wo'st crew of dock sc.r.a.pings I ever set eyes on," growled Tyke. "Ditty did a lot of talking in the boat--I watched 'em through my gla.s.s. Them six are his close friends, Cap'n Rufe. They've laid their plans----"

"Holy mackerel!" exclaimed Captain Hamilton. "What are you saying, Tyke?"

"I've figgered out that we aren't going to have things our own way down here," the other said earnestly. "I've been waiting for you to say something, Cap'n Rufe, ever since that Bug-eye accused Allen like he did. Ditty's on to our game--has been on to it right along--an' he selected this crew of wharf-rats for a purpose."

"I agree with you, Mr. Grimshaw," Drew declared eagerly. "That's what Ditty was after when he tried to rob you at the time you were knocked down by the automobile. You were right. He did push you back in front of the machine, and then he searched your pockets while you were on the ground."

"For what?" demanded Captain Hamilton, staring.

"For the paper and the map. Ditty believed Mr. Grimshaw carried that confession in his pocket," Drew replied.

The master of the schooner rose and began to walk about in excitement.

"That's it! He was lurking outside your office door that day, Tyke, when we first found the papers in Manuel Gomez's chest. I see it now.

He was aboard the schooner that very evening, too, when I told Ruth at dinner about the pirate's doubloons. He might have been eavesdropping then."

"An' I bet he flung poor Parmalee over the rail himself," said Tyke.

Hamilton's expression changed and he shook his head at that.

"He'd git rid of one of the after-guard that way," urged Tyke.

"Parmalee could shoot. An' if it comes to a fight----"

"My soul!" groaned Captain Hamilton suddenly. "And Ruth with us!"

"What about Ruth?" asked that young lady cheerfully, coming from her cabin. "Aren't you all ready yet? I am going ash.o.r.e with you."

"Yes; you'd better come," said her father gloomily.

"Why, what is the matter?" she demanded.

"We were just wondering," said Drew quickly, a.s.suming a casual tone to cover their real emotion, "if the crew suspected our reason for touching at this island."

Captain Hamilton picked up the ball at once.

"But I don't believe they do," he said. "Of course, it would have seemed strange to the mate and to Rogers if I hadn't given them some explanation, especially as we came out in ballast. So I dropped hints that we were out on a survey expedition that couldn't be talked of just now. They probably have the idea that we're looking up a suitable coaling station for the Government, or something of that kind. To carry that out, I've got some surveyor's instruments here that we'll take along with us, just for a blind."

"Let's hope it'll work," said Tyke dubiously. "An' it won't do any harm to take our guns along."

"There's a pair of revolvers for each of us," replied Captain Hamilton, opening the closet where he kept the arms that Drew had previously seen; "and we'll take half a dozen guns along with us in the boat.

There may be snakes or wild animals on the islands."

"I must have a revolver too, Daddy," said the girl.

"Of course, my dear," agreed the captain.

"Mebbe you'd better not put any cartridges in it, Cap'n Rufe," said Grimshaw, taking Ruth playfully by the arm, "They'd be more dangerous to us than to anything else."

"It's mean of you to say that, Mr. Grimshaw," pouted Ruth. "You'll find that I can use a gun as well as anybody."

"Mebbe so, mebbe so, my dear," said Tyke indulgently.

"Hadn't we better take some provisions along?" asked Ruth, as she slipped the cartridges into her revolver and put the weapon in the pocket of the sports skirt that she had donned.

"That won't be necessary," replied the captain. "We'll be back before nightfall. This is just a little preliminary scouting. We won't have time for more than that this afternoon. The real work of searching for the treasure will begin to-morrow."

The preparations finished, the party went on deck.

"Crew had their dinner yet, Mr. Ditty?" Captain Hamilton asked of his first officer.

"My watch have, sir," was the answer. "The others are eating now."

"Pick out half a dozen men and lower the boat," ordered the captain.

"We're going ash.o.r.e for a few hours. We'll be back for supper."

"How long will we lay up here, sir?"

"Can't tell yet. Perhaps two or three days. Possibly a week or more."

"How about sh.o.r.e leave for the men, sir?"

"Beginning to-morrow, they can go ash.o.r.e in batches of ten. This afternoon, Mr. Rogers and a boat's crew can take the long boat and some casks and go ash.o.r.e to look for water."

"Very well, sir," replied the mate, with a curious expression on his face.

As he turned away, his one eye fell on Drew. They had not met since the fight two days before. They stared at each other for several seconds, until Ditty's eye fell before the concentrated fury in those of the young man.

Ruth, who had witnessed the interchange of looks, put her hand lightly on Drew's arm.

"Aren't you going to help me into the boat, Allen?" she asked.