Everyone was taken to the top of the temple, where a tall, rounded tower jutted. From this tower they could see the setting sun, falling over the rim of the western sky. As the sun disappeared, the Folk of the Secret Mountain fell on to their knees and chanted a weird song.

“A sort of prayer to the sun, I suppose,” said Ranni grimly. He spoke to Pilescu in his own language. “I don’t much like this, do you, Pilescu?”

Prince Paul pricked up his ears. “Why don’t you like it, Ranni?” he asked. Ranni would not tell him. All of them watched the sun. It disappeared suddenly over the edge of the world. At once the countryside was plunged into darkness, the valley and mountains disappeared from sight, and only the shimmering of the golden floor lighted the summit of the queer mountain.

A tall, red-haired man went into the centre of the shining courtyard, and spoke loudly and violently. Ranni listened and tried to understand as much as he could.

“What is he saying?” asked Mike.

“As far as I can make out he is asking the sun to stay away and let the rain come,” said Ranni. “It seems that the rain is very much overdue, and these people are praying to the sun to dress himself in the thick clouds that will bring the rain they want. I expect they have crops somewhere on the mountain-side and are in danger of losing them if the rains don’t come!”

That night the little party slept on rugs in the cold, wind-swept temple. They were all alone on the mountaintop, for their guards disappeared behind the yellow sliding door, slid it back into place again and fastened it with great long bolts. Ranni and Pilescu explored the temple, the courtyards and the corridor by the light of a torch — but there was no other door down into the mountain save the big shining one. It was as impossible to leave the top of the mountain as it had been to leave their underground room the night before.

How everyone wondered where Jack and Mafumu were, and if Captain and Mrs. Arnold were anywhere near! They did not know that the four were together! When they had left the sun-trap, they had taken the passage that led inwards, and walking as quietly as they could, had come across a queer collection of store-rooms. No one was there, so they had explored them thoroughly.

In one store-room, cut out of the solid rock, were dyes and paints of all kinds. Captain Arnold examined them closely. “Look,” he said, “this explains the red hair of the Folk of the Mountain. This is a very strong red dye, and these people use it for their hair, to scare any strangers they meet. And see — this is the curious yellow pigment they use for their skins!”

Everyone looked at the flat pots he was holding. They were full of the yellow ointment that the Secret Mountain Folk used on their skin! No wonder the Folk looked so very queer! They dyed their hair and painted their skin yellow!

When Jack knew this he no longer felt afraid of the curious appearance of the mountain people. Golly! If it was only paint and grease there was nothing strange to be afraid of! He took one of the flat pots of yellow grease and put it into his pocket. “It will be interesting to take home!” he said cheerfully.

“If we ever do get home,” thought Captain Arnold to himself. They left the store-rooms and went on down a curving passage that had a very high roof. Soon they heard a noise — and they came to the banks of the underground river, which swirled along through the mountain, black and swift. It was strange to see it there, running through an enormous cave.

“We shall get lost in this mountain if we are not careful,” said Captain Arnold, stopping and looking round. “I wonder if we are getting anywhere near where this river rushed out of the mountainside, Jack.”

Jack asked Mafumu, and the boy shook his head. “Long, long, long way,” he said mournfully. “Mafumu not know way.”

The party of four went across the cave and left the swirling river behind. They were not sure that it was the same one that made the waterfall. Captain Arnold felt certain that the mountain held two or three rivers, that all joined to make one. It was no use to follow the one they had just left.

Soon they came to a curious door, quite round and studded with a strange pattern of suns. Behind it they heard voices! “What are they saying, Mafumu?” whispered Jack.

Mafumu pressed himself as close to the door as he dared. His sharp ears picked up the voices — and as he listened Mafumu grew pale under his dark skin! He crept back to the others.

“They say that the sun-god is angry,” whispered Mafumu. “They say that he is burning up the mountains because he has no servant. He needs a servant before he will hide his head in the great clouds and bring rain. And it is from one of us that he asks for a servant!”

Mafumu spoke partly in his own language and partly in Jack’s. The other boy understood him and told Captain and Mrs. Arnold what he had said. The Captain was silent for a long time.

“It is what I feared,” he said. “One of us will be thrown down the mountain-side to lessen the anger of their sun-god! We must try to reach Mike, Peggy, Nora and the others at all costs, as soon as we can. We must warn them!”

As Captain Arnold was speaking the round door was flung open, and a tall, red-bearded man came out. It was dark in the passage, and he did not see the little company pressed against the wall. He was about to step out into the passage when there came the sound of running feet — and someone with flowing robes rushed up from the opposite direction.

There was a sharp talk, and then an excited shouting and calling. Mafumu pressed himself against Captain Arnold and whispered in his ear.

“We run quick, quick!”

Captain Arnold knew at once that their escape had been discovered, and that they must get away from there quickly. But where were they to go?

“Back to the river!” he whispered to Mrs. Arnold, and the four of them made their way silently and swiftly down the passages to the dark river. Behind them they felt sure they heard the sound of voices and footsteps.

They went right to the bank of the river. “We could get in and go across to the other side, where that high rock is, and hope that our heads wouldn’t show above the water,” said Jack.

But just then Mafumu made a curious discovery. He ran to Jack, caught hold of his arm, and whispered something excitedly, pulling at Jack all the time to make him follow him. The boy went — and saw what Mafumu had so unexpectedly found. It was a small boat, of a curious shape, painted in curving stripes.

“Look! Let’s get in and go down the river!” said Jack. “I can hear someone coming now, quite plainly!”

There didn’t seem anything better they could do. So they all packed themselves into the funny rounded boat and pushed off down the dark river. There were paddle-like oars in the boat, but Captain Arnold did not need to use them because the current took them along strongly.

That was a very strange journey through the heart of the Secret Mountain. Sometimes the river ran through big caves, which gleamed with green phosphorescent light. Sometimes it ran through dank tunnels, and the four in the boat could feel the slimy walls as they floated through. Once the river opened out into an enormous pool, whose sides lapped the walls of a high cave.

Mafumu was terrified. He clung to Jack tightly, and muttered strings of strange-sounding words, fingering his necklace of crocodile teeth. Jack was sorry for the other boy, especially as he felt afraid too!

The river swirled along fast. Sometimes the boat knocked against rocks and nearly upset. Once Mrs. Arnold almost fell overboard, and Captain Arnold only just snatched at her in time. Everyone wondered where the journey would end.

It ended in a most astonishing manner. The river suddenly became much less violent, and the current seemed to fall away to nothing. The boat almost stopped and Captain Arnold had to use the paddles to get it forward. They were in a fairly wide tunnel with a low roof, and not far ahead there seemed to be an archway, through which a bright light shone.