He looked down on the two men, who were lying on their backs with their mouths open. Beside them were two neat sacks, strong and thick. Julian wondered what was inside them. They certainly had not had them when they came up the track.

The boy gazed down the hillside, frowning, trying to probe the mystery of where the men had been, and what they were doing up here - and suddenly he jumped violently. He stared as if he could not believe his eyes.

A squat and ugly face was peering out from a bramble bush there. There was almost no nose, and an enormous mouth. Who could it be? Was it someone spying on Lou and Dan? But what a face! It didn't seem human.

A hand came up to rub the face - and Julian saw that it was hairy. With a start he knew who the face belonged to - Pongo the chimpanzee! No wonder he had thought it such an ugly, unhuman face. It was all right on a chimp, of course - quite a nice face - but not on a man.

Pongo stared at Julian solemnly, and Julian stared back, his mind in a whirl. What was Pongo doing there? Was n.o.bby with him? If so, n.o.bby was in danger, for at any moment the men might wake up. He couldn't think what to do. If he called out to warn n.o.bby, he would wake the men.

Pongo was pleased to see Julian, and did not seem to think the roof of a caravan a curious place to be in at all. After all, he often went up on the roofs of caravans. He nodded and blinked at the boy, and then scratched his head for a long time.

Then beside him appeared n.o.bby's face - a tear-stained face, bruised and swollen. He suddenly saw Julian looking over the roof of the caravan, and his mouth fell open in surprise. He seemed about to call out, and Julian shook his head frantically to stop him, pointing downwards to try and warn n.o.bby that somebody was there.

But n.o.bby didn't understand. He grinned and, to Julian's horror, began to climb up the hillside to the rocky ledge! The men were sleeping there, and Julian saw with dismay that n.o.bby would probably heave himself up right on top of them.

'Look out!' he said, in a low, urgent voice. 'Look out, you fathead!'

But it was too late. n.o.bby heaved himself up on to the ledge, and, to his utmost horror, found himself sprawling on top of Tiger Dan! He gave a yell and tried to slide away - but Dan, rousing suddenly, shot out a hand and gripped him.

Lou woke up, too. The men glared at poor n.o.bby, and the boy began to tremble, and to beg for mercy.

'I didn't know you were here, I swear it! Let me go, let me go! I only came up to look for my knife that I lost yesterday!'

Dan shook him savagely. 'How long have you been here? You been spying?'

'No, no! I've only just come! I've been at the camp all morning - you ask Larry and Rossy. I been helping them!'

'You been spying on us, that's what you've been doing!' said Lou, in a cold, hard voice that filled the listening Julian with dread. 'You've had plenty of beatings this week, but seemingly they ain't enough. Well, up here, there's n.o.body to hear your yells, see? So we'll show you what a real beating is! And if you can walk down to the camp after it, I'll be surprised.'

n.o.bby was terrified. He begged for mercy, he promised to do anything the men asked him, and tried to jerk his poor swollen face away from Dan's hard hands.

Julian couldn't bear it. He didn't want to give away the fact that it was he who had been spying, nor did he want to fight the men at all, for he was pretty certain he would get the worst of it. But n.o.body could lie in silence, watching two men treat a young boy in such a way. He made up his mind to leap off the roof right on to the men, and to rescue poor n.o.bby if he could.

n.o.bby gave an anguished yell as Lou gave him a flick with his leather belt - but before Julian could jump down to help him, somebody else bounded up! Somebody who bared his teeth and made ugly animal noises of rage, somebody whose arms were far stronger than either Lou's or Dan's - somebody who loved poor n.o.bby, and wasn't going to let him be beaten any more!

It was Pongo. The chimpanzee had been watching the scene with his sharp little eyes. He had still hidden himself in the bush, for he was afraid of Lou and Dan - but now, hearing n.o.bby's cries, he leapt out of the brambles and flung himself on the astonished men.

He bit Lou's arm hard. Then he bit Dan's leg. The men yelled loudly, much more loudly than poor n.o.bby had. Lou lashed out with his leather belt, and it caught Pongo on the shoulder. The chimpanzee made a shrill chattering noise, and leapt on Lou with his arms open, clasping the man to him, trying to bite his throat.

Tiger Dan rushed down the hill at top speed, terrified of the angry chimpanzee. Lou yelled to n.o.bby.

'Call him off! He'll kill me!'

'Pongo!' shouted n.o.bby. 'Stop it! Pongo! Come here.'

Pongo gave n.o.bby a look of the greatest surprise. 'What!' he seemed to say, 'you won't let me punish this bad man who beat you? Well, well - whatever you say must be right!'

And the chimpanzee, giving Lou one last vicious nip, let the man go. Lou followed Dan down the hill at top speed, and Julian heard him crashing through the bushes as if a hundred chimpanzees were after him.

n.o.bby sat down, trembling. Pongo, not quite sure if his beloved friend was angry with him or not, crept up to him putting a paw on the boy's knee. n.o.bby put his arm round the anxious animal, and Pongo chattered with joy.

Julian slid down from the roof of the caravan and went to n.o.bby. He, too, sat down beside him. He put his arm round the trembling boy and gave him a hug.

'I was just coming to give you a hand, when Pongo shot up the hill,' he said.

'Were you really?' said n.o.bby, his face lighting up. 'You're a real friend, you are. Good as Pongo, here.'

And Julian felt quite proud to be ranked in bravery with the chimpanzee!

CHAPTER SIXTEEN

A SURPRISING DISCOVERY

'Listen - somebody's coming!' said n.o.bby, and Pongo gave an ugly growl. The sound of voices could be heard coming up the hill. Then a dog barked.

'It's all right. It's Timmy - and the others,' said Julian, unspeakably glad to welcome them back. He stood up and yelled.

'All right! Come along!'

George, Timmy, d.i.c.k and Anne came running up the track. 'Hallo!' shouted d.i.c.k. 'We thought it would be safe, because we saw Lou and Dan in the distance, running along at the bottom of the hill. I say - there's Pongo!'

Pongo shook hands with d.i.c.k, and then went to the back of Timmy, to shake hands with his tail. But Timmy was ready for him, and backing round, he held out his paw to Pongo instead. It was very funny to see the two animals solemnly shaking hands with one another.

'Hallo, n.o.bby!' said d.i.c.k. 'Goodness - what have you been doing to yourself? You look as if you've been in the wars.'

'Well, I have, rather,' said n.o.bby, with a feeble grin. He was very much shaken, and did not get up. Pongo ran to Anne and tried to put his arms round her.

'Oh, Pongo - you squeeze too hard,' said Anne. 'Julian, did anything happen? Did the men come? Have you any news?'

'Plenty,' said Julian. 'But what I want first is a jolly good drink. I've had none all day. Ginger-beer, I think.'

'We're all thirsty. I'll get five bottles - no, six, because I expect Pongo would like some.'

Pongo loved ginger-beer. He sat down with the children on the rocky ledge, and took his gla.s.s from Anne just like a child. Timmy was a little jealous, but as he didn't like ginger-beer he couldn't make a fuss.

Julian began to tell the others about his day, and how he had hidden on the caravan roof. He described how the men had come - and had gone under the caravan - and then moved it. They all listened with wide eyes. What a story!

Then n.o.bby told his part. 'I b.u.t.ted in and almost gave the game away,' he said, when Julian had got as far as the men falling asleep and snoring. 'But, you see, I had to come and warn you. Lou and Dan swear they'll poison Timmy somehow, even if they have to dope him, put him into a sack and take him down to the camp to do it. Or they might knock him on the head.'

'Let them try!' said George, in her fiercest voice, and put her arm round Timmy. Pongo at once put his arm round Timmy too.

'And they said they'd damage your caravans too - maybe put a fire underneath and burn them up,' went on n.o.bby.

The four children stared at him in horror. 'But they wouldn't do a thing like that, surely?' said Julian, at last. They'd get into trouble with the police if they did.'