Even the monkeys were quiet — but when they began to move in the tree and to chatter again Ranni awoke everyone. The great heat of the day was gone. If they were going to do any more exploring they must set off at once.

And soon they had a great surprise — for when they rounded a rocky corner of the yellow mountain they heard voices! They all stopped still at once, hardly daring to breathe. Voices! Could they be natives — or folk from the Mountain.

The voices were deep and harsh — like the voices of rooks, Jack thought. Ranni waved Mafumu forward, for he knew that the boy could move as silently as a shadow. Mafumu slid down on to his tummy and wriggled forward like a snake. It was marvellous to watch. The other children could not imagine how he could get along as quickly as he did.

Everyone else sank down quietly behind the bushes and stayed as still as mice. Mafumu wriggled forward into a thick bush. It was prickly, but the boy did not seem to feel the scratches. He parted the bush-twigs carefully and looked through.

Then he looked back towards Ranni, his face full of excitement, and beckoned him forward with a wave of his hand. The children had the amusement of watching big Ranni do his best to wriggle forward on his front, just as Mafumu had done. The enormous Baronian did very well, however, and was soon beside the boy, peering through the prickly bush.

The two of them stayed there for some time. The others waited impatiently, hearing the harsh voices of the strangers, and wondering what Ranni and Mafumu could see.

Suddenly there came a grating sound, a rolling, groaning noise — and the voices stopped. The queer noise came again, such a grating sound that it set everyone’s teeth on edge! With the rolling sound of rumbling thunder the noise echoed around — and then stopped. Now only the sharp calls of the birds, the ceaseless hum of thousands of insects and the silly chatter of monkeys could be heard — and behind it all the roaring of the waterfall in the distance.

Ranni and Mafumu crawled back, their faces shining with excitement. They took hold of the other children and hurried them to a safe distance. And in the shade of a great rock Ranni told them what he and Mafumu had seen.

“Quick, Ranni, tell us everything!” said Jack.

“We saw some of the Folk of the Secret Mountain!” said Ranni. “They certainly do look queer. It is just as Mafumu’s uncle said — they have flaming red hair and beards and their skins are a funny yellow. I couldn’t see if their eyes were green. They were dressed in flowing robes of all colours, and they wore turbans that showed their red hair.”

“Golly!” said Mike, his eyes wide with excitement. “Go on — what happened?”

“The queerest thing happened,” said Ranni. “I hardly know if I believe it or not. Well — let me tell you. As we lay there, watching these people talking together in their funny harsh voices, we noticed that they were near a very curious kind of rock.”

“What sort of rock?” asked Pilescu.

“It was an enormous rock,” said Ranni. “It was strange because it was much smaller at the bottom than at the top, so that it looked almost as if it must fall over. Well, as we watched, one of the Mountain Folk went up to the rock and pushed hard against it.”

“Why, he couldn’t surely move an enormous rock!” cried Mike.

“That’s what I thought,” said Ranni. “But that rock must be one of these curious balancing rocks that can be pivoted, or swung-round, at a touch, no matter how big they are. There are just a few known in the world, and this is another.”

“What happened when the rock swung round?” asked Pilescu.

“It not only swung round, it slid to one side,” said Ranni. “Just like the rock in the story of Ali Baba that you told me! And behind it was a great door in the mountain-side studded with shining knobs that glittered in the sun!”

Everyone stared at Ranni in silence, too excited to speak. So that was the way into the mountain! They had stumbled on it quite by accident.

“Go on,” whispered Peggy at last.

“I couldn’t see how the great doorway was opened,” said Ranni. “It seemed to slide to one side, very quietly — but whether it was opened from the outside or the inside I really don’t know. Then the rock rolled back into place again, and swung back into position with that terrific roaring, groaning sound you heard.”

“And did the people go into the mountain?” asked Mike.

“They did,” answered Ranni, “We saw no more of them.”

Everyone sat silent for a while, thinking of the queer entrance to the Secret Mountain. So that was what Mafumu’s uncle had meant when he said that to get into the mountain one had to walk through rock!

“Well — what are we going to do?” said Jack. “We know the way in — but I wonder how that great studded door is opened! Oh, Ranni — can we try to get in tonight?”

“We’d better,” said Ranni. “I will try by myself and see what happens. You can all find good hiding-places nearby and watch. I’ll take my gun, you may be sure!”

The children could hardly wait for the sudden nightfall to come. They found themselves good hiding-places — though Jack and Mafumu found the best. Theirs was up a big tree not far from the mountain entrance. Mafumu found it, of course, and helped Jack up there. The others were behind or in the middle of thick bushes.

When the stars hung brightly, and a crescent moon shone in the sky, Ranni crept forward to the strange rock, whose black shadow was enormous in the night. Everyone watched, hardly daring to breathe in case anything happened to Ranni.

Big Ranni stepped quietly up to the rock. He thought he knew exactly where to heave, for he had seen one of the Mountain Folk move the rock and had noted the exact place. But it was difficult to find it at night.

Ranni shoved and pushed. He pressed against the rock and heaved with all his might. Nothing happened. He stopped and mopped his hot forehead, wondering which was the right place to press against.

He tried again and again — and just as he was giving up something happened. He pushed at the right place quite by accident! With a groaning roar the enormous rock swung slowly round and then slid back. The noise it made was terrific. Ranni sprang back into the shadows, afraid that a hundred Mountain Folk might come rushing out at him.

The studded door shone in the moonlight. It did not open. It stood there; big and solid, strange and silent, barring the way. Nobody came. Nobody shouted to see who had swung back the rock. Only the night-sounds came on the air, and the sound of the distant waterfall.

Everyone waited, trembling with excitement. Jack nearly fell out of his tree, he shivered so much with wonder and expectation. But absolutely nothing happened. The rock remained where it was, the door shone behind.

“Ranni! Maybe the Mountain Folk haven’t heard the noise!” whispered Pilescu. “Go and try the door.”

Ranni crept forward again, keeping to the deep-black shadows. Once or twice the moonlight glinted on the gun he held in his hand. Ranni was taking no chances!

The others watched him from their hiding-places. He went right up to the door. He felt over it with his hand. He pushed gently against it. He tried to slide it to one side. He tried all the studs and knobs to see if by chance any of them opened the great door. But no matter what he did, the door remained shut.

“Let us come and see,” whispered Mike to Pilescu. The boy felt that he could not keep still any longer. Pilescu was also longing to go to the mountain door, so he, Mike, Paul, and the two girls crept forward in the shadows.

Jack wanted to come too — and began to climb carefully down the tree, getting caught in a great creeper as he did so. Mafumu tried to untangle him, but the more he tried, the more mixed-up poor Jack got.