Now that people had really come at last to search the island the children were glad to carry out their plans, for the days of waiting had been very upsetting. They had laid their plans so well that everything went like clockwork. Daisy, the cow, did not seem a bit surprised to have Jack leading her to the inner cave again, and went like a lamb, without a single moo!

Jack got her safely through the narrow passage to the inner cave and left her there munching a turnip whilst he went to see if he could help the others. Before he left the outer cave he carefully rubbed away any traces of Daisy’s hoofmarks. He arranged the bracken carelessly over the entrance so that it did not seem as if anyone went in and out of it.

Mike arrived with the hens just then, and Jack gave him a hand. Mike squeezed himself into the little tiny cave that led by the low passage to the inner cave, for it had been arranged that only Jack and the cow should use the other entrance for fear that much use of it should show too plainly that people went in and out.

Jack passed him the sack of hens, and Mike crawled on hands and knees through the low passage and into the big inner cave where Daisy was. The hens did not like being pulled through the tiny passage and squawked dismally. But when Mike shook them out of the sack, and scattered grain for them to eat, they were quite happy again. Jack had lighted the lantern in the inner cave, and it cast its dim light down. Mike thought he had better stay in the cave, in case the hens found their way out again.

So he sat down, his heart thumping, and waited for the others. One by one they came, carrying odds and ends. Each child had done his or her job, and with scarlet cheeks and beating hearts they sat down together in the cave and looked at one another.

“They’re not at the island yet,” said Jack. “I took a look just now. They’ve got another quarter-mile to go. Now, is there anything we can possibly have forgotten?”

The children thought hard. The boat was sunk. The cow and the hens were in. The fire was out and well scattered. The hen-yard was covered with sand and heather. The yard-fence was taken up and stored in Willow House. The seed-patches were hidden. The milk-pail was taken from the spring.

“We’ve done everything!” said Peggy.

And then Mike jumped up in a fright. “My hat!” he said. “Where is it? I haven’t got it on! I must have left it somewhere!”

The others stared at him in dismay. His hat was certainly not on his head nor was it anywhere in the cave.

“You had it on this morning,” said Peggy. “I remember seeing it, and thinking it was getting very dirty and floppy. Oh, Mike dear! Where can you have left it? Think hard, for it is very important.”

“It might be the one thing that gives us away,” said Jack.

"There’s just time to go and look for it,” said Mike. “I’ll go and see if I can find it.”

He crawled through the narrow passage and out into the cave with the low entrance. He squeezed through that and went out into the sunlight. He could see the boat from where he was, being rowed through the water some distance away. He ran down the hill to the beach. He hunted there. He hunted round about the hen-yard. He hunted by the spring. He hunted everywhere! But he could not find that hat!

And then he wondered if it was anywhere near Willow House, for he had gone there that morning to store the hen-yard fences. He squeezed through the thickly growing trees and went to Willow House. There, beside the doorway, was his hat! The boy pushed it into his pocket, and made his way back up the hillside. Just as he got to the cave-entrance he heard the boat grinding on the beach below. The searchers had arrived.

He crawled into the big inner cave. The others greeted him excitedly.

“Did you find it, Mike?”

“Yes, thank goodness,” said Mike, taking his hat out of his pocket. “It was just by Willow House - but I don’t expect it would have been seen there, because Willow House is too well hidden among those thick trees to be found. Still, I’m glad I found it - I’d have been worried all the time if I hadn’t. The boat is on the beach now, Jack; I heard it being pulled in. There are four men in it.”

“I’m just a bit worried about the passage to this inner cave from the outer cave,” said Jack. “If that is found it’s all up with us. I was wondering if we could find a few rocks and stones and pile them up half-way through the passage, so that if anyone does come through there, he will find his way blocked and won’t guess there is another cave behind, where we are hiding!”

“That’s a fine idea, Jack,” said Mike. “It doesn’t matter about the other entrance, because no grown-up could possibly squeeze through there. Come on, everyone. Find rocks and stones and hard clods of earth and stop up the passage half-way through!”

The children worked hard, and before half an hour had gone by the passage was completely blocked up. No one could possibly guess there was a way through. It would be quite easy to unblock when the time came to go out.

“I’m going to crawl through to the cave with the small entrance and peep out to see if I can hear anything,” said Jack. So he crawled through and sat just inside the tiny, low-down entrance, trying to hear.

The men were certainly searching the island! Jack could hear their shouts easily.

“Someone’s been here!” shouted one man. “Look where they’ve made a fire.”

“Trippers, probably!” called back another man. “There’s an empty tin here, too - and a carton - just the sort of thing trippers leave about.”

“Hi! Look at this spring here!” called another voice. “Looks to me as if people have been tramping about here.”

Jack groaned. Surely there were not many foot-marks there!

“Well, if those children are here we’ll find them all right!” said a fourth voice. “It beats me how they could manage to live here, though, all alone, with no food, except what that boy could buy in the village!”

“I’m going over to the other side to look there,” yelled the first man. “Come with me, Tom. You go one side of the hill and I’ll go the other - and then, if the little beggars are dodging about to keep away from us, one of us will find them!”

Jack felt glad he was safely inside the cave. He stayed where he was till a whisper reached him from behind.

“Jack! We can hear voices. Is everything all right?”

“So far, Mike,” said Jack. “They are all hunting hard - but the only thing they seem to have found is a few footmarks round the spring. I’ll stay here for a bit and see what I can hear.”

The hunt went on. Nothing seemed to be found. The children had cleared everything up very well indeed.

But, as Jack sat just inside the cave, there came a shout from someone near the beach.

“Just look here! What do you make of this?”

Jack wondered whatever the man had found. He soon knew. The man had kicked aside the heather that had hidden the hen-yard - and had found the newly scattered sand!

“This looks as if something had been going on here,” said the man. “But goodness knows what! You know, I think those children are here somewhere. It’s up to us to find them. Clever little things, too, they must be, hiding away all traces of themselves like this!”

“We’d better beat through the bushes and the bracken,” said another man. “They may be hiding there. That’d be the likeliest place.”

Then Jack heard the men beating through the bracken, poking into every bush, trying their hardest to find a hidden child. But not one could they find.

Jack crawled back to the cave after two or three hours and told the others what had happened. They listened, alarmed to hear that the hen-yard had been discovered even though they had tried so hard to hide it.

“It’s time we had something to eat,” said Peggy. “We can’t light a fire in here, for we would be smoked out, but there are some rolls of bread I made yesterday, some wild strawberries, and a cold pudding. And lots of milk, of course.”