The Five-Find-Outers and Buster met in the little summer-house at the top of Pip’s garden that afternoon. It was warm and sunny there, and they wanted to be quite alone and hear again and again of all that Fatty had done that morning - especially of his neat escape from Mr. Goon’s boxroom.

‘I simply can’t imagine what he said when he unlocked the door and found you gone, Fatty’ said Bets. ‘I’d have loved to be there!’

Fatty showed them the two specimens of handwriting he had taken from Miss Tittle and Mrs. Moon. He told them that Nosey couldn’t write, so that ruled him out completely. ‘And if you look at this receipt, which Mrs. Nosey signed, you’ll see she could never have written those letters either, even if Nosey had told her what to put into them,’ said Fatty.

‘It’s a funny thing,’ said Daisy, ‘we’ve had plenty of Suspects - but one by one we’ve had to rule them out. There honestly doesn’t seem to be a single real Suspect left, Fatty.’

‘And except for seeing the letters, we’ve got no real Clues either,’ said Larry. ‘I call this a most disappointing Mystery. The letter-writer went a bit mad this week, didn’t he - or she - sending letters to Mrs. Lamb - and Mrs. Moon and Mr. Goon. Before that, as far as we know, only one a week was sent.’

‘Isn’t old Clear-Orf funny when I keep pretending I’ve got a new Clue?’ said Fatty, grinning. ‘Do you remember his face when I pulled old Waffles, the white rat, out of my pocket? I just happened to have him there that day.’

‘Poor old Clear-Orf doesn’t believe anything we say any more,’ said Pip. ‘I do wonder if he really suspects somebody of writing those letters - someone we don’t know about?’

‘He may have some clues or ideas we haven’t been able to get,’ said Fatty. ‘I shouldn’t be surprised if he solves this Mystery after all - and not us.’

‘Oh, Fatty!’ cried everyone in dismay.

‘How can you say that?’ said Bets. ‘Wouldn’t it be dreadful if he did - so that Inspector Jenks was pleased with him, and not with us.’

Inspector Jenks was their very good friend, and had always been very pleased with them because they had managed to solve some curious mysteries in Peterswood before. They had not seen him since the Christmas holidays.

‘Let’s get out of this summer-house,’ said Larry. ‘It’s absolutely melting in here! Fatty, don’t forget to take your red-haired wig and things back with you tonight. This summer-house isn’t an awfully safe hiding-place for them. Pip’s mother might easily walk in and see them stuffed under the seat.’

‘I’ll remember,’ said Fatty, yawning. ‘Golly, it was funny going into Goon’s house this morning as a red-headed messenger-boy - and coming out just myself, and nobody spotting me! Come on - let’s go for a walk by the river. It’ll be cool there. I shall fall asleep in this heat!’

As they went down the drive they met Mr. Goon cycling up. They wondered which of the household he was going to see. He stopped and got off his bike.

‘You know that there telegraph-boy, that brought you that telegram some time back?’ he said. ‘Well, I happen to know he’s a fake, see? There’s no telegraph-boy like that. And I’m making strict inquiries into the matter, I am - yes and into fake telegrams too, see? And I warn you all, if you hob-nob with red-heads, you’ll get into Serious Trouble. Very Serious Trouble.’

‘You do frighten me,’ said Fatty, making his eyes go big.

‘And I’ll have None of your Sauce!’ said Mr. Goon majestically. ‘I know more than what you think, and I advise you all to be careful. Call that dog orf!’

‘Come here, Buster,’ said Fatty, in such a mild voice that Buster took no notice at all. He went on prancing round Mr. Goon’s ankles.

‘I said, call him orf!’ repeated Mr. Goon, doing little prances too, to avoid sudden rushes by Buster.

‘Come here, Buster,’ said Fatty again, in an extremely polite voice. Buster ignored him completely.

‘That’s not calling him orf!’ shouted Mr. Goon, beginning to lose his temper. ‘Yell at him, go on! Nuisance of a dog!’

Fatty winked at the others, and with one accord they all opened their mouths and yelled at the top of their voices. ‘COME HERE, BUSTER!’

Mr. Goon jumped violently at the noise. He glared. Buster also jumped. He went to Fatty.

‘Not pleased even now, Mr. Goon!’ said Fatty sweetly. ‘Oh dear - there’s no pleasing you at all, I’m afraid. Wait a minute - I believe I’ve got a really good clue to hand you - ah, here it is!’

He took out a match-box and gave it to the policeman. Mr. Goon opened it suspiciously. It was a trick match-box, and, as Mr. Goon opened it, he released a powerful spring inside which sprang up and shot the match-box high in the air. Mr. Goon got quite a shock.

He went purple, and his eyes bulged.

‘So sorry, so sorry,’ said Fatty hastily. ‘It must have been the wrong match-box. Wait a bit - I’ve got another...’

If Buster had not been there with his ready teeth Mr. Goon might quite well have boxed Fatty’s ears. He looked ready to burst. Fearing that he might say something he ought not to, poor Mr. Goon hurriedly mounted his bicycle and rode up the drive, breathing so heavily that he could be heard all the way to the kitchen-door.

‘He’s gone to talk to Mrs. Moon again,’ said Pip. ‘I expect they’ll come to blows! Let’s get on. Oh, Fatty, I thought I should burst when that trick match-box went up in the air. Goon’s face!’

They strolled down the lane to the river. It was pleasant there, for a breeze blew across the water. The children found a sunny place beside a big bush and lay down lazily. A swan came swimming by, and two moor-hens chugged across the water, their heads bobbing like clockwork.

‘Let’s forget all about the Mystery for a bit,’ said Daisy. ‘It’s so nice here. I keep on thinking and thinking about those letters, and who could be writing them - but the more I think the less I know.’

‘Same here,’ said Pip. ‘So many Suspects - and not one of them could apparently have Done the Deed. A most mysterious mystery.’

‘One that even the great detective, Mr. Frederick Sherlock Holmes Trotteville can’t solve either!’ said Larry.

‘Correct!’ said Fatty, with a sigh. ‘I almost - but not quite - give it up!’

Larry’s hat blew away and he got up to go and get it. ‘Blow!’ he said. ‘There’s old Clear-Orf again - cycling over the field-path. He’s seen me too. Hope he doesn’t come and make a row again. He’d like to eat you alive, Fatty, you’re so aggravating.’

‘Sit down quickly, in case he hasn’t seen you,’ said Daisy. ‘We don’t want him here.’

Larry sat down. They all watched the blue water flowing smoothly by. The moor-hens came back again, and a fish jumped at a fly. A very early swallow dipped down to the water. It was all very peaceful indeed.

‘I should think old Clear-Orf didn’t see me after all,’ said Larry. ‘Thank goodness. I think I’m going to sleep. There’s something very soothing about the gurgling of the water - a lovely, peaceful afternoon.’

Heavy breathing disturbed the peace, and clumsy footsteps came over the grass towards their bush. Mr. Goon appeared, his face a familiar purple. He carried a small sack in his hand, and looked extremely angry. He flung the little sack down fiercely.

‘More Clues, I suppose!’ he sneered. ‘More of your silly, childish jokes! White rats and match-boxes! Huh! Gah! What a set of children! And now these Clues - hidden nicely under a bush for me to find, I suppose? What do you think I am? A nitwit?’

The children were astonished at this outburst, and Bets was really alarmed. Fatty put out a quick hand on Buster’s collar, for the little Scottie had got his hackles up and was growling fiercely, showing all his teeth.

‘What’s up, Goon?’ said Fatty, in a sharp, rather grown-up voice.

‘You know as well as I do!’ said the policeman. ‘More Clues! I suppose you’ll tell me next that you don’t know anything about that sack of Clues! Gah!’