"Odder and odder," said Andy to himself. "We seem to have come to some most mysterious islands—and I'm going to find out what's happening—or my name isn't Andy!"
Chapter 9
The Mysterious Visitors
The next day the children talked about the queer noise that Andy had heard.
"I tell you it sounded exactly like a motor-bicycle," Tom said firmly, and nothing would make him admit that it wasn't.
"If I didn't know there couldn't possibly be any landing-ground on these rocky islands I might have thought the noise was made by an aeroplane," said Andy thoughtfully. "But that's silly. Why would an aeroplane come here? And where would it land?"
"It might be a motor-boat, perhaps!" said Jill suddenly. The others stared at her. For some reason, nobody had thought of motor-boats till then.
"Yes—I believe it was!" said Andy, "It had that throbbing sound that a motor makes. Now what's a motor-boat doing here? But, anyway—it means that we can be rescued!"
"Of course!" said Tom. "Well—let's go and find the motor-boat. What a surprise they'll get when they suddenly see us I They'll wonder wherever we've come from."
"Tom, don't be in so great a hurry," said Andy, pulling the impatient boy down into the heather. "I think there's something funny going on here—and before we show ourselves we'd better find out if we shall be welcome!"
"Oh," said Tom, surprised. The girls looked rather alarmed.
"What do you mean—something funny?" said Jill.
"I don't know, as I said yesterday," said Andy. "But what we will do is to see where that motor-boat is. It won't have seen our signal because it came in the night—and we know it's not anywhere this side of the island, or we would have seen it this morning. I vote we go to that rocky ledge where we get the best view of the second island and see if by any chance a boat has been able to get through the reef of rocks and sail into the quiet lagoon inside."
The four children made their way to the high rocky ledge. Andy made them lie down flat and wriggle like Red Indians as they reached it.
"Better not let ourselves be seen, if anyone is down there," he whispered. So, as flat as snakes, they wormed their way to the rocky ledge—and when they got there, they had the biggest surprise of their lives!
In the quiet water that lay outside the second island was a large and powerful seaplane!
Yes—a great seaplane, whose wings spread widely over the blue water. No small motor-boat purred there. It was the seaplane's engine that Andy had heard so mysteriously in the middle of the night.
"Whew! Look at that!" whispered Andy, his face going as red as a beetroot with excitement. "I never thought of a seaplane! What a very extraordinary thing!"
"Let's get up and shout and wave." begged Jill. "I'm sure they will love to rescue us."
"Haven't you seen the sign on the wings?" asked Tom, in a curiously angry voice. The girls looked. The sign of the crooked cross was painted on each wing—the sign of the enemy, the foe of half the world.
"Golly!" said Mary, and she drew a deep breath. "Enemies I Using these islands! Do they belong to them?"
"Of course not," said Andy. "But they are desolate, and out of the usual ships' course—and they've been noted by the enemy, and he's using them as a kind of base for something—seaplanes perhaps."
"Well—what are we going to do?" asked Tom.
"We shall have to think," said Andy. "One thing is certain. We won't show ourselves tell we've found out a fitted more. We don't want to be taken prisoner."
"That's what that food was for, then—the people who come here," said Jill. "I suppose the seaplanes come over here for food and petrol. Ifs a good idea. How I wish we could get away and tell my father about it—he'd know what to do. I guess he'd clean up this place, whatever it's used for!"
"I say—hadn't we better take down our signal whilst that seaplane is here?" asked Jill. "If it happens to see it, the enemy will know there are people on this island". And" what about the fishing-boat? That might be seen too."
"I don't think so," said Andy. "It's well hidden between those rocks. But the signal had certainly better come down. We won't put it up any more. Come on. Tom—we'll take it down now."
"We'll come with you," said the girls. But Andy shook his head.
"No," he said "From now oh, somebody must keep a watch on that seaplane. We must find out all we can. We will be back with you as soon as possible—but you must stay here and watch."
So the two girls were left behind whilst the boys ran across the island to take down their flapping signal.
"I don't know where in the world we should hide if we were discovered and hunted for," said Andy, rolling up the sail. "There isn't a single place here to hide away in—not a cave or anything."
Tom felt rather uncomfortable. He didn't want to be hunted for on that bare island! "I wish we could see how many men there are in that seaplane," he said, "and what they are doing, and everything."
"Where are your field-glasses?" asked Andy suddenly. "They would be just the thing to use. We could see everything as dearly as could be, then!"
"And my camera, too!" said Tom, jumping for joy. "What about my camera? We could take some photographs of the seaplane—then everyone would have to believe us when we get back—if ever we do get back!"
"That's a fine idea!" said Andy, really pleased. "Golly! If we could take some pictures of that seaplane with the crooked cross showing up clearly, there wouldn't be the least doubt of our story when we got home. Tom, let's go and get your glasses and your camera straight away."
They dumped the sail into a bush and ran to the shack. They took Tom's field-glasses and picked up the camera to see if it needed a new film. No—there was a new one inside.
"Better not use up all the film on the seaplane," said Andy. "There might be other interesting and extraordinary things to photograph—you never know!"
"Oh, I've got three or four films," said Tom. "I brought plenty with me, thinking I was going to get some good bird pictures, you know. Come on-let's go back to the girls and see what they have to report."
The girls were very glad indeed to see the boys. They had a lot to tell.
"Andy! Tom! As soon as you had gone the men in the seaplane put out a funny little round sort of boat," said Jill in excitement. "And they paddled to shore in it, and went to our cave. What a good thing the sea had washed away all our footprints!"
"It was, indeed," said Andy. "Tom, give me the field-glasses. I want to have a look through them."
Andy stared through the powerful glasses. They were so strong that they seemed to bring the seaplane near enough to touch! The boy saw the great crooked crosses boldly painted on the wings. He saw the little rubber boat left bobbing in the surf, whilst the men visited the cave—either to take something to it, or to bring something away, Andy did not know which.
"There seems to be someone in the seaplane," said Andy. "And, look—there are some men coming from the cave!"
Andy could see them very clearly through his field-glasses—and the others could see them too, though not so well, of course. To them the men looked like faraway dolls.
"They've gone to get food from the cave," said Andy in excitement. "And I guess there's a store of petrol somewhere else for them to get when they want to. Food—and petrol—just what I thought! Using these islands saves enemy planes from having to go hundreds of miles to their own country's stores. My word—we have stumbled on to something queer!"