Nora sat crouched against the entrance of the little cave. She could hear the six hens inside, clucking softly as they scratched about. Jack knelt near her, peering through the bracken, trying to see what the boat was doing.

“Mike has rowed our own boat to where the brambles fall over the water, and has pushed it under them,” said Jack, in a low voice. “I don’t know where he is now. I can’t see him.”

“Where’s Peggy?” whispered Nora.

“Here I am,” said a low voice, and Peggy’s head popped above the bracken a little way down the hill. “I say - isn’t this horrid? I do wish those people would go away.”

The sound of voices came up the hillside from the lake below.

“Here’s a fine landing-place!” said one voice.

“They’ve found our beach,” whispered Jack.

“Pull the boat in,” said a woman’s voice. “We’ll have our supper here. It’s lovely!”

There was the sound of a boat being pulled a little way up the beach. Then the trippers got out.

“I’ll bring the gramophone,” said someone. “You bring the supper things, Eddie.”

“Do you suppose anyone has ever been on this little island before?” said a man’s voice.

“No!” said someone else. “The countryside round about is quite deserted - no one ever comes here, I should think.”

The three children crouched down in the bracken and listened. The trippers were setting out their supper. One of the hens in the cave began to cluck loudly. Nora thought it must have laid an egg.

“Do you hear that noise?” said one of the trippers. “Sounds like a hen to me!”

“Don’t be silly, Eddie,” said a woman’s voice scornfully. “How could a hen be on an island like this! That must have been a blackbird or something.”

Jack giggled. It seemed very funny to him that a hen’s cluck should be thought like a blackbird’s clear song.

"Pass the salt,” said someone. “Thanks. I say! Isn’t this a fine little island! Sort of secret and mysterious. What about exploring it after supper?”

“That’s a good idea,” said Eddie’s voice. “We will!”

The children looked at one another in dismay. Just the one thing they had hoped the trippers wouldn’t do!

“Where’s Mike, do you suppose?” said Peggy, in a low voice. “Do you think he’s hiding in our boat?”

“I expect so,” whispered Jack. “Don’t worry about him. He can look after himself all right.”

“Oh, my goodness! There’s Daisy beginning to moo!” groaned Peggy, as a dismal moo reached her ears. “She knows it is time she was milked.”

“And just wouldn’t I like a cup of milk!” said Jack, who was feeling very thirsty.

“Can you hear that cow mooing somewhere?” said one of the trippers, in surprise.

“I expect it’s a cow in a field on the mainland,” said another lazily. “You don’t suppose there is a cow wandering loose on this tiny island, do you, Eddie?”

“Well, I don’t know,” said Eddie, in a puzzled voice. “Look over there. Doesn’t that look like a footprint in the sand to you?”

The children held their breath. Could it be true that they had left a footprint on the sand?

“And see here,” went on the tripper, holding up something. “Here’s a piece of string I found on this beach. String doesn’t grow, you know.”

“You are making a great mystery about nothing,” said one of the women crossly. “Other trippers have been here, that’s all.”

“Perhaps you are right,” said Eddie. “But all the same, I’m going to explore the island after supper!”

“Oh, put on the gramophone, Eddie.” said someone. “I’m tired of hearing you talk so much.”

Soon the gramophone blared through the air, and the children were glad, for they knew it would drown any sound of Daisy’s mooing or the hens’ clucking. They sat in the bracken, looking scared and miserable. They did not like anyone else sharing their secret island. And what would happen if the trippers did explore the island and found the children?

Nora began to cry softly. Tears ran down her cheeks and fell on her hands. Jack looked at her and then crept silently up. He slipped his arm round her.

“Don’t cry, Nora,” he said. “Perhaps they won’t have time to explore. It is getting a bit dark now. Do you see that big black cloud coming up? It will make the night come quickly, and perhaps the trippers will think there’s a storm coming and row off.”

Nora dried her eyes and looked up. There certainly was a big black cloud.

“It looks like a thunderstorm,” said Peggy, creeping up to join them.

“Oooh!” said Nora suddenly, almost squealing out loud. “Look! Someone’s coming up the hill! I can see the bracken moving! It must be one of the trippers creeping up to find us!”

The children went pale. They looked to where Nora pointed - and sure enough they could see first one frond of bracken moving, and then another and another. Someone was certainly creeping up the hill hidden under the fronds.

Nora clutched hold of Jack. “Don’t make a sound,” he whispered. “No one can possibly know we’re here. Keep quiet, Nora. We’ll slip inside the cave if he comes much nearer.”

They sat silently watching the swaying of the tall bracken as the newcomer crept through it. It was a horrid moment. Was someone going to spring out on them?

“Get inside the cave, you two girls,” whispered Jack. “I think you’ll be safe there. I’m going to slip round the hill and come up behind this person, whoever he is.”

The girls crept just inside the cave and parted the bracken that grew around it to see what Jack was going to do. He was just slipping away when the person creeping up the hillside stopped his crawling. The bracken kept still. This was worse than seeing it move! Oh dear!

Then a head popped out of the bracken, and Nora gave a loud squeal.

“Mike!” she said. "Mike!”

“Sh, you silly chump!” hissed Peggy, shaking her. “You’ll be heard by the trippers!”

Fortunately the gramophone was going loudly, so Nora’s squeal was not heard. The three children stared in delight at Mike. It was he who had been creeping up through the bracken after all! What a relief! He grinned at them and put his head down again. Once more the bracken fronds began to move slightly as Mike made his way through them up to the cave.

“Oh, Mike,” said Nora, when he came up to them. “You did give us such a fright. We thought you were a tripper coming after us!”

“I got a good view of them,” said Mike, sitting down beside the others. “There are three men and two women. They are tucking into an enormous supper.”

“Do you think they’ll explore the island as they said?” asked Peggy anxiously.

“Perhaps this thunderstorm will put them off,” said Mike, looking up at the black sky. “My word, it’s brought the bats out early! Look at them!”

Certainly the little black bats were out in their hundreds. The hot, thundery evening had brought out thousands of insects, and the bats were having a great feast, catching the flies and beetles that flew through the air.

It was the bats that sent the trippers away. One of the women caught sight of two or three bats darting round under the trees, and she gave a shriek.

“Ooh! Bats! Ooh! I can’t bear bats! I’m frightened of them. Let’s pack up and go quickly!”

“I can’t bear bats either!” squealed the other woman. “Horrid little creatures!”

“They won’t hurt you,” said a man’s voice. “Don’t be silly.”

“I can’t help it; I’m frightened of them,” said a woman. “I’m going!”

“But I wanted to explore the island,” said Eddie.

“Well, you’ll have to explore it another day,” said the woman. “Just look at the sky, too - there’s going to be a dreadful storm.”

“All right, all right,” said Eddie, in a sulky voice. “We’ll go. Fancy being frightened of a few bats!”

The children on the hillside stared at one another in delight. The trippers were really going. And no one had discovered them. Goody, goody!

“Good old bats!” whispered Jack. “Would you think anyone would be scared of those little flitter-mice, Nora?”

“Aunt Harriet was,” said Nora. “I don’t know why. I think they are dear little creatures, with their funny black wings. Anyway, I shall always feel friendly towards them now. They have saved us from being found!”

Daisy the cow mooed loudly. Jack frowned. “If only we had milked Daisy before the trippers came!” he said.

“Did you hear that?” said one of the trippers. “That was thunder in the distance!”

The four children giggled. Nora rolled over and stuffed her hands into her mouth to stop laughing loudly.

“Good old Daisy!” whispered Mike. “She’s pretending to be a thunderstorm now, to frighten them away!”

Nora gave a squeal of laughter, and Jack punched her. “Be quiet,” he said. “Do you want us to be discovered just when everything is going so nicely?”

The trippers were getting into their boat. They pushed off. The children heard the sound of oars, and peeped out. They could see the boat, far down below, being rowed out on to the lake. A big wind sprang up and ruffled the water. The boat rocked to and fro.

“Hurry!” cried a woman’s voice. “We shall get caught in the storm. Oh! Oh! There’s one of those horrid bats again! I’ll never come to this nasty island any more!”

“I jolly well hope you won’t!” said Jack, pretending to wave good-bye.

The children watched the boat being rowed down the lake. The voices of the people came more and more faintly on the breeze. The last they heard was the gramophone being played once again. Then they saw and heard no more. The trippers were gone.

“Come on,” said Jack, standing up and stretching himself. “We’ve had a very narrow escape - but, thank goodness, no one saw us or our belongings.”

“Except that footprint and a bit of string,” said Mike.

“Yes,” said Jack, thoughtfully. “I hope that man called Eddie doesn’t read anywhere about four runaway children and think we might be here because of what he heard and found. We must be prepared for that, you know. We must make some plans to prevent being found if anyone comes again to look for us.”

A distant rumble of thunder was heard. Jack turned to the others. “Not Daisy mooing this time!” he grinned. “Come on, there’s a storm coming. We’ve plenty to do. I’ll go and get Daisy, to milk her. Nora and Mike, you catch the hens and take them back to the hen-yard - and Mike, make some sort of shelter for them with a couple of sacks over sticks, or something, so that they can hide there if they are frightened. Peggy, see if you can light the fire before the rain comes.”

“Ay, ay, Captain!” shouted the children joyfully, full of delight to think they had their island to themselves once more!